There has been lots of talk and ink and electronic words scattered about the political landscape regarding contraception. Here is Joe's basic rule of thumb:
If you cannot afford a lambskin/rubber/condom/raincoat/love sock/willie warmer/johnny bag/pudding cup or the monthly script for The Pill (or gas/bus fare to get to Planned Parenthood since they claim that to be their mission) you probably should not be making the beast with two backs.
If you don't have the greenbacks to prevent pregnancy, you sure has hell cannot afford to have a baby. Kids are a lifetime commitment and they are expensive.
If you are poor and cannot control your sexual urges, I suggest you 'handle' the problem.