My point is that men can protect themselves from women like this by abstaining from casual sex, but men don't want to hear it. Men want to be considered victims when this happens, but this has been going on too long for men to still be unaware of it. Fine, if men want to have sex with this woman, then let them support their children.
The underlying problem is irresponsibility, on the part of both participants. Unless, of course, he is getting screwed in more ways thn one, and her plan is to get pregnant in order to collect the check. He may be told that she has taken care of pregnancy protection when she has not.
Although the balance sheet doesn't work for productive people, in the low income spectrum, it works hand in hand with state and federal programs (WIC, low income housing, etc.) to add up to a modest living. The real victims of this are children who may grow up as a bargaining chip. Dad can do something about that, but it takes determination and effort.
Bottom line: Guys have a choice, and they are exercising it, in the bedroom as well as at the altar.
This removes one of the premier means of traditional control women have exerted over men.