You've confused me by your response to Cephus. Why do you think the concern is only financial? When there is an unwanted pregnancy one of two situations will result: either the man agrees to marry the woman and try to asssume full parental responsibility, or he rejects marriage and is compelled by law to assume financial responsibilities.
In the first case, where the male is unhappy and only "doing what's right" when he marries the woman; he will resent his position and act out in various ways while he remains tied to the marriage and family scenario. Whether this scenario ends in divorce or not, his attitude while married often results in spousal abuse (intiated by either the man or the woman), child physical and/or emotional abuse, and all sorts of other horrors. If he divorces and tries to start a family with a woman he does "love" this creates further issues, both for his new family and the old one.
In the second case, even though he tries to avoid further contact he is bound by his child support duties. Thus he is often challenged by the mother in court as the child ages and costs increase. Meanwhile he has to continue to deal with her as she argues, cajoles, negotiates, rants, demands, etc.
Then there is the child, who naturally wants to know more about the father. Often the mother's anger is reflected in how she instructs the child about why the father wants nothing to do with it. This leads to many emotional issues with the child. We always hear stories of a child seeking out and trying to confront the father at some later time. Finally, all the issues mentioned about a divorced male starting a new family apply to the father who never stuck with the original woman and child. Now any family he tries to start has to deal with these issues too.
All of this because the woman has an "out" but the man does not.