dude, i got something faul to add....
in college i used dip a lot... and would spit in cups and empty cans all over the place. and i kept a big blue plastic cup with a papertowel it and used to nut in that. One night i was really fucked up and put a dip in and sat infront of the computer to jerk off, well midway through i had to spit and just picked up the cup to spit in and it was my nut cup. yack...