existentialist sex 

A sexual experience that is planned in advance and set up to be different or weird on purpose.

She was bored enough to take up his suggestion for existentialist sex and wore the moon boots and feather boa.

existentialist sex by quazy_quisp April 11, 2009

sexistentialist 

Somebody who practices existentialism. In bed.

I'm quite the existentialist. In bed.

sexistentialist by Katsu May 8, 2005