Kicking someone directly in the asshole. Perhaps so hard that the big toe gains insertion.

When one gives themself an everclear enema and then squirt it out while lighting it on fire.

When a girl is a virgin but her genitals still look all mangled and weird.

When someone wears an artical of clothing used to mop up various sex fluids. There was a song about this on the Japanese release of Musicforthemorningafter by Pete Yorn.

Covering your genitals (if not your whole body) in tin foil for sex

When a guy puts a metal sheath on his dick and makes a new hole between a chick's vagina and asshole, then leaves the sheath in there for later use. Also good for robot style sex.

professional pornography featuring doughy studs to help the average home viewer "project"