[Ingtar]

The father, in at least one case, was a homeless 34 year old.

[Clemenza]

Correct, and as we were discussing on a related page, it was a combination of an odd sexual fetish ("oooh, it would turn me on SO much to get knocked up by a dirty, filthy homeless guy) and the fact that he was easily available and wouldn't be around to cause trouble. Of course, he won't have a paycheck to be docked for child support either.