After having sex with your girlfriend you keep the condom close so that after your girlfriend falls asleep you place your load in her hand and tickle her nose so as to make her slap your load in her face. Same thing can be done with whipped cream but not as funny.
Jay "last night I waited till my wife went to sleep and gave her a slippery slap"
Mark "how did that work out for you?"
Jay "she kicked my ass when she woke up..."