1) Because a man who can't spell fidelity will surely be able to practice it.

2) Her WIC checks + his minimum wage pay = a vastly improved home income (it nearly equals the poverty line!).

3) His bus pass is just too darn sexy to resist.

4) Her life expectancy in the hood is only about 30 years anyway, so she might as well make a horrible dating choice with the few years that she has left.

5) She needs a shoulder to cry on after ordering off of the "McDonald's Dollar Millionaire" menu and thinking that she actually would become a real millionaire.

6) She already has every major STD, so he can't possibly give her any more.

7) She was dating Thugettes for a while, but despite her hopes, she wasn't getting pregnant.