a kid is buying condoms at a pharmacy. the pharmacist helps him out and the kid goes "i'm hoping to score some tonight, visiting perents...blah blah blah."
then at dinner the kid says prayer for a long time and the girlfriend says "i didn't know you were so religous/have so much faith"
the kid replies with "i didn't know your dad was a pharmacist!"
or something along those lines....
edit:
i founds itttt... second page...
http://www.soompi.com/forums/topic/177922-a-virgin-joke/
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