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Consensual brother-sister incest: Insights from various personal accounts, adolescence to mature adulthood

[This entry was initially posted to the original Red Keyhole blog on 7 February 2011.]

Brother-sister incest may be the most common form of consensual incest. How common it is, in the sense of measurable statistical data, is not readily known – in part because “incest” surveys typically fail to differentiate between abusive (often forcible) incest and consensual sexual relationships, and also because participants involved in consensual relationships are typically reluctant to acknowledge this activity because of the severe legal social-cultural prohibitions against incest of any form.

Consequently, about all one can do is to rely primarily on anectdotal evidence – thus getting a sense that consensual sibling incest is probably more common that usually thought, and acquiring some notion of the kinds of personal situations that have led individuals to have these relationships.

This was the basis of a question posted to the Topix Human Sexuality Forum, originally in March 2010, which asked “Have you ever actually had sex with a brother or sister”, “How old were you”, and what the circumstances were.

The following brief personal narratives have been excerpted as ostensibly authentic and helpful from the sizable array of responses posted. In the judgement of Red Keyhole, they illustrate psychological and physical aspects of this alternative sexual behavior, and are selected here for educational purposes.

It must be noted that some of these responses suggested incestuous sexual play, but not actual intercourse. In some cases, the sexual activity appears to have occurred at extremely early ages (including early puberty); however, such activity (in the general population) has been validated in other studies, and the narratives are included here for continuity and to provide a more complete assessment of the range of situations and circumstances in which sibling incestuous activity can occur.

On the basis of these anecdotes (and the assumption that all or most of them are reliable), it would appear that the onset of consensual incestuous activity between siblings can occur in a wide range from very early adolescence and even pre-puberty to adulthood, usually young adulthood. (Sexual activity among young people under the “age of consent” also invokes the issue of “age of consent” vs. effective consent.)

The original postings have been slightly edited for readability, but original language has been retained as much as possible. Some of the language is quite mature and sexually explicit, but this is important in illustrating such aspects as psychological dynamics, emotional attitudes, and physical behavior.

[Response from "Kim", Chester, NJ]

I am the only girl in my [family] with 8 brothers. I have had sex with 4 of them.

[The] oldest was 18 and I was 12. I was walking into my room after a shower and closed the door. I matured early so I had some great tits. I took the towel off and turned on my music. I went to my closet and all the sudden a hand covered my mouth and said “If you want it, reach back and stroke it.” I reached back, and the cock was huge! That was my first time with a brother.

[Response from "Brenda", United States]

I had sex with my brother…

[Response from "Ben", Sammamish, WA]

Done everything but [intercourse] with sis. 18/16 ages.

Response from “Anonymous”, Cincinnati, OH]

As I’ve gotten older, I’ve found that an amazing number of the people I know have had brother-sister sex when they were younger….

Due to its sensitive nature and penalties resulting in a negative incentive, I believe that it is grossly under-reported, only gets reported when there is a problem … i.e., pregnancy, for example.

I know about 7 women who have had sex with a sibling … confirmed by other independent sources … It has come out when they are in their 40′s or 50′s … some were good, others bad experiences …

No data on their current situations, if any, though … they keep them well buried, and rightfully so.


Incest between brothers and sisters often begins in adolescence.

[Response from "Digmysis", Durham, NC]

Well [over] the last decade, my sister and I always have enjoyed our weekends together. Going to the mountains, the beach, sking, hiking, boating and yes, great mind-blowing sex, or more importantly, love-making.

We’ve bonded to each other. In 2008, I asked her to move in with me. We’ve been together ever since. I don’t even care about other women anymore… I see my sister more as a committed loving partner. I pretty much wanted a commitment with her for several years since college.

[Response from "SH", Bellingham, WA]

One time when I was 16 my little sister was very drunk and kept following me around blathering.

I had to take a shower an she just followed me right into the bathroom like she did when she was little. So I got undressed and got in the shower.

She finally shut up when I closed the shower door. I could see her standing out there as I turned on the water.

Then she undressed and came in the shower with me like when she was eight and started yapping again. I handed her the soap and let her wash me. When it was my turn to wash her, I made sure to wash her chest a lot, even though she was pretty flat at that age.

Then I started washing her crotch. She kept yapping for, like, five minutes before she noticed I was rubbing her [vaginal area] raw. She shut up for about a minute and enjoyed it.

Then she just said, “Why don’t you just fuck me?”
By then my dick was pretty hard, so I squatted down and let her put it inside. We only fucked for like a minute before out Mom started calling us.

Bad ending … She got in trouble for being drunk, and I got yelled at for letting her, even though I wasn’t at home when it happened.

[Response from "Starman", Chatswood, Australia]

I was 15 … My younger sis was in my bed one night, reading stories together. She had a nightie on, no knickers, so I found out later.

After we read stories, we were going too sleep, spooning with her in front of me … I got a hard on … She felt it on her leg, and asked me what it was … I let her feel and touch me, and showed her how too wank me off … I came everywhere. She just kept rubbing me the whole time.

I pulled her nightie up, and then knew she was naked underneath. I played with her sweetness … For ages she was humping my hand till I put my end in her a little … She loved it. So did I … After that night we had lots of fun … She was [very young] … Happy times …

[Response from "City slick", United States]

I stayed a night at my older sister, 24, one-bedroom apartment. I fell asleep in her bed watching movies. She came in from partying, drunk, and fell into the bed.

My sister is drop-dead gorgeous, about 5’10″ [tall], long black hair, the perfect body, and milk chocolate skin. I am not to bad myself. She tossed and turned to get comfortable in her bed. She turned, and her perfect ass was on my d!ck … I began getting hard, and I knew she felt it.

She then reached into my boxers and grabbed it. I then pulled my boxers off and got naked. She did the same … It was … we both wanted it.

I began fucking her from the back, unprotected … It was the best I ever had … I was 18 at the time.

Now we are both married. She is 34, and I am 28, and we still get it on every free chance we have….

Response from “Anonymous”, Gainesville, FL]

When I came back from Vietnam in ’70, my wife (now ex) and I were separated, pending a divorce. I would visit my sister, who lived nearby in Norfolk, and her husband was in the Navy on an extended Mediterranean cruise (I was 27 years old, and my sis was 35 years old).

Occasionally, Sis, knowing I was as horny as she was, would tease me by rubbing against me occasionally in the kitchen or somehow.

Sis had a station wagon with a rear-facing seat, and on Friday nights, we’d take her young kids to a drive-in movie and back into a parking spot. The kids would be asleep shortly after it got dark. Most of the time no one would park near us because of the kids and their noise.

Sis and I would “make out” for a while, then Sis would lean over and begin to suck my dick, and suck me till I came and was dry. Her head would be bobbing up and down and she knew how much drool to have to make her lips slide. I loved the erotic sounds she made as she sucked or was sucking on my balls.

I’d then position her and remove her shorts and panties,(if she was wearing any), and I’d suck her pussy til she was bucking her hips and pushing her cunt lips to my lips as she came.

When we got home after the movie, we’d put the kids to bed, and then we’d hop on her bed and start fucking. We have done every sex act and every position we could, especially if her kids were in school and we were alone for the day. She and I BOTH enjoyed it when she sucked me off, and both equally enjoyed it when I ate her out, and Sis did love anal sex.

Her husband was somewhat of a religious type and didn’t do her orally or anally. Over the years, it’s become more and more difficult for us to find time alone for us to do it, but we’re planning for the next time I go home for a visit.

I will say, to my sister’s credit, that she was a fine-looking girl in [highschool] and won a county beauty contest as “Miss ******* County”. When I was about 11 or 12 years old, I used to fantasize about my sis letting some of her [boyfriends] do her, but I’d sort of get jealous.

After she and I began having sex, and she’d suck me off, before she’d swallow my load, she’d pull my lips to hers and kiss me and run her tongue into my mouth. I thought that was the kinkiest thing I had ever done.

A few years ago, I was living near her, before moving here … I was visiting her one morning, and she’d bathed, but had dressed only in a nightgown. We were having coffee, and I began to massage her neck. She said “You’re about to start a fire you wont be able to put out, little brother.”

We moved to her formal dining room, and she sat in a chair and began sucking me. I started thrusting and fucking her in the mouth, and she removed her mouth only to suck on my balls. Then she leaned back against the table, and I knelt and began sucking her pussy.

Soon she asked if I wanted to “corn-hole” (anal sex) her like I used to, and I said “You know it”. She retreived some KY and lubed up and guided me into her rectum. I played with her nipples and listend to her moan like old times.

After a while I came and I asked her if she enjoyed it as much as I did, and she said “You know it.” That was a few years ago, and the last opportunity we had to be alone with each other.


Adult brother-sister incest may begin in adolescence and continue into adulthood, or onset may occur when both siblings are adults.

[Response from "Richie", Macon, GA]

My sister and I played with each other sexually almost as far back as I can remember. At age 11 she began bringing boys home with her, usually for sex, and mostly black. She would, and still does, let me sit right beside them and watch. I usually watch and masturbate.

[Response from "Anderson", UK

When I was 16, my sister came and asked me if she could borrow some money. I had been on the pub for a couple of hours and was clearly not sober.

I asked how much ... £10, she said, she needed some top-up for her phone.

In a poor attempt to be fun, I said she could give me two handjobs, one now, and one when she came back.

To my surprise, she just said "Take off your pants and make yourself comfortable."

I wanted to see how far she would go, she properly wanted to see the same. so I took off my pants and t-shirt, sat on the couch. She looked a bit surprised, but got on her knees in front of me, and took a firm grip around my cock and stated jerking me off. It didn't take long before I had a full erection.

Just before I came she changed the direction of my cock so the cum hit my chest and stomach ... I got irritated, but she said that she didn't want to hit the couch, which I couldn't argue against.

She took the money from my wallet and told me to take a shower, and be ready for the second round when she came back. I was in my room lying naked on my bed when she came, and gave me one more, which lasted longer than the first.

[Response from "The Army Ranger", Florida]

I was about 16 … one day after I came home after school and went upstairs into one of my young sister’s (Dalia. 14 years old) room looking for her, and I saw her with her legs spread wide as she was fucking herself with a hairbrush.

She didn’t notice me by the door as I was enjoying the show. Our parents were at work.

I just busted her masturbating … She got the shock of her life whe she saw me standing there with my dick out [of] my pants at full staff.

I ended up black mailing her by not telling our parents. Everytime time we had a chance we fk, I’ll never come inside her puss, only when I fk in the ass. We had great times, now I’m 56, she is 54 & married, we still do it when she comes to visit sometimes.

[Response from "Johnnybop", Tonawanda, NY]

When I was sixteen and my sister was twelve, my dad took my mom on a two-week-long trip for their anniversary, leaving me to watch my sister. At this point, my sister was starting to get sexy. I would watch her in the shower and take her panties from her room.

One day I joined her in the shower. She was alarmed, but did not object. We started making out and rubbing each other. Eventually we worked our way upstairs to our parents’ room and had passionate sex. She screamed when I broke her hymen.

To this day, my sister is great at oral sex and she is a squirter.

I’m 30 and my sister is 26. Last year.

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