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The act of inserting your penis into a girl's butt chin and sliding it up in down in between the crevices.
Guy 1: Yo girl has a massive butt chin
Guy 2: Yeah i know we have chin sex all the time and i cum up her nose.
chin sex by carltoncumsalot July 13, 2010
The act of using your chin to have sex
Bobby had chin sex with Suzie on Tuesday.
chin sex by Beckzie December 23, 2006

Massage Chair Sex 

You set your massage chair all the way up to the top and on percussion, and have your partner rest his/her head on the part of the chair where the percussion is happening. You then place your penis inside your partners mouth for your enjoyment.
Massage Chair Sex is recommended if your partner is handicapped

Chair sex 

When a girl ties you to a chair during sex.

She smiled, grabbed me by the wrist, and pulled me into her dorm room. We made out ferociously for several minutes, running our hands through each other’s bodies. Afterwards, we both stripped naked.

She had me sit in her desk chair, then tied my wrists to each armrest and my ankles to each chair leg with silk ribbons. She straddled me, mounted me, wrapped her arms around my neck, and we both gasped as she lowered herself onto my cock. With her breasts jiggling in front of my face, she bounced up and down as she rode me, smiling at me as she did so. My wrists and ankles involuntarily twitched in pleasure against my restraints.
We both moaned as we orgasmed simultaneously, her squirting all over my cock and my cock releasing tremendous amounts of cum as I exploded with such force and pressure inside of her. While I was still gathering myself from post-orgasm shock, she got dressed, putting on a pair of shorts and a tank top.

“Well?” I said. “Aren’t you going to untie me?”

“Actually,” she grinned, and my heart skipped a beat, “My roommate should be back in a few minutes. I thought I’d leave you tied up here as a surprise for her.”

“Wait, what?!” I cried out, desperately trying to wriggle my wrists and ankles free of my restraints, but to no avail.

“It’s no use.” she said, laughing. “I tied you up good, you’re not going anywhere”

She leaned down to face me, still grinning. “She doesn’t know, of course. But don’t worry, she’s really hot.”

She then leaned in to whisper in my ear. “And who knows… maybe you’ll get lucky a second time.“

She cupped my face in her hands, kissed me on the lips, then walked out the door, letting it shut behind her.

I was already getting hard at the thought of Round 2 of chair sex.
When you put your willy under a bbw's double chin and pork her until you jizzy jazz.
Chin sex:
Guy: Hey you fine fluffy thang, I find your chin chinsatiable, mind if my dong rides your neck all night long?

Sexy bbw: mmmmm yes daddy, do yo thang, I'll just be laying here eating bon bons and tweaking my nippular area.
Chin sex by TheNotoriousPIG February 17, 2018

chair sex 

when one inserts a chair leg into the female genitalia
Mel likes to pass the time having chair sex
chair sex by lisalisalisalisa April 16, 2008