I don't know about this. Like Rich, I'm not a woman either, but I often hear black women complain about the lack of "good black men" available. One of the reasons for this, these same women claim, is because we are either gay, DL, already married, don't date black women, or are in PRISON.
There are plenty of black men who aren't in prison, and there aren't a plethora of "good black women" available to us either. So the way I see it, if a woman is willing to date a man in prison then that's her choice; just don't complain about there not being any good men available if it doesn't work out.