Okay, if it's just a hookup, then yeah, the guy should have been smarter/more responsible and wrapped it up. And yeah, I agree, people do stupid things in the heat of passion. Anyway, if it was a hookup, then I don't really feel so sorry for the guy, though I still think that the hypo woman's actions are morally repugnant. I agree with Chuck, that the STD issue is definitely another reason to use protection.
(The typical birth control "accident" that women hear about tends to be the trap a man into marriage tactic, so I assumed the woman was in a relationship with the man. A hookup is a totally different scenario in terms of blame.)
Note: This discussion is a nice change from the T4s/online LSs suck and T1s rule discussions that predominate this board.