(thing) by Eraser_ Sun Mar 03 2002 at 10:44:45
In reference to Living with mismatched libidos:

Penis in Vagina. Basically, an acronym for sex. Just plain old vanilla sex, however you happen to like it. "30 minutes of vigorous PIV" -> 30 minutes of having some fairly hard and heavy generic sex.
del.icio.us Facebook Digg StumbleUpon Reddit I like it!