Well obviously there are plenty of good men who wouldn't hurt a child. But statistics show that there are many who would. So my comment about mothers is that if a woman is going to have an unrelated male under the same roof as her children, she should choose wisely and for the right reasons which typically don't involve financial security. Better still, get to know the man, and make sure they're worthy enough to marry rather than just move in. Add to all that, if a biological father can prove to be a better parent and caretaker and is in a better situation to protect the child than an at-risk mother, then by all means I think he should have primary custody.