this is when you are turned on by sexual activities between 22of one sex and 7 of the other, or any other 2 numbers that when divided by eachother form pi. this is from a film or something, but i cant remember.
Male 1: i got a new "film" foryou to borrow
Male 2:Really? whats it about, pisex?
Male 1:yes it is
Male 2:oooo gimme gimme gimme
Male 1:i wish i was pisexual