Sexsister 

A friend who is more like a sister, but you can have sex with her.

This is my sexsister, _____. We have LOTS of fun to together. 🤤😉

Sexsister by NikkiB94 December 17, 2022

Stepsister 

“Accidentally” stuck

“Stepsister, how’d you get stuck again?!”

Stepsister by Stepbro😉 July 1, 2020

stepsister 

stepsister means someone who gets stuck in a washing machine

what are you doing stepbro? says stepsister

stepsister by Iwillkillmyselfwithpeanuts September 2, 2020

Sextosterone 

A sex hormone rampant among males, giving them the primeval urge to plant their seed deep within a worthy female.

Jack's sextosterone raged within his bloodstream, as he tore off Jill's clothing and shagged her mercilessly.

Sextosterone by Testosterone Jack October 26, 2009

Sexistential Crisis 

Moment where you do not know anything about your gender or sexuality.

"I'm going through a sexistential crisis right now can you please advise me?"

Sexistential Crisis by sexistentialcrisisdunderhead December 21, 2018

Sexistentialism 

A philosophy that proposes that a person should live for the moment, because when you die, you’re screwed. A big proponent of this was Sartre, Kama Sartre.

When a Danish philosopher has sexistentialism with you, you’ll be Soren the morning.

Sexistentialism by Jarod Kintz October 24, 2007

stepsister 

A stupid whore who keeps getting stuck in shit.

AKA The washing machine queen

"stepsister": help me stepbro I'm stuck in the washing machine!
Brother: Your such a fucking stepsister figure it out yourself I'm not calling the fire department again.

stepsister by Dogemazing January 22, 2021