anal sex reveresed. instead of the man sticking his penis up the womans butt, the woman wears a strap-on and sticks it up the mans butt.
charles: are you sure jean? you probably won't feel anything.
jean: i don't care charles. i'll do anything for you.
(jean proceeds to peg charles, when all of a sudden, dave comes in the room)
dave: hey charles, do you wanna see eraser - oh, jesus fucking christ!
kim: fuck! they're at it again!
dave: what the hell? is jean wearing a...strap-on?
charles: do you guys ever knock?!
during sex, when man (or woman, whichever you prefere) goes down on the woman when she's on her period. he (or she, whichever you prefere) will swallow the woman's blood clots. hence, clotting.
jean: are you sure, charles? i'm on my period. it's pretty messy.
charles: i don't care. i'll do anything for you.
(charles proceeds to go down on jean, when all of a sudden, kim walks into the room)
kim: charles, can i borrow your- oh my god!
joey: what is it? oh shit!
kim: charles is clotting jean!