I would hazard a guess here and say men don't like to use condoms because it feels better without one. Can I have half a million dollars now?
I'm willing to stand up at an Obama news conference for half that amount and tell everyone that's the problem. Heck. I wouldn't even care if my mother heard me say it.
In any case, your use of the term "pork" is incorrect. It may be wasteful spending (debatable), but it isn't designed to primarily service a specific Congressman's district.