Sounds to me like you're excusing the cruel, manipulative behavior of the woman by attempting to paint this guy as "stupid". But human companionship and the sexual relation is the number one driving force of men and women in this world. There is nothing "stupid" about seeking a mate---- unless, of course, you are saying that women are dangerous and should be approached only with the utmost caution.
There is everything stupid about seeking a mate. There is nothing stupid about seeking a good wife. This guy's stupidity is that he was just seeking a mate. (Just looking to get laid and maybe have a relationship later)
These days an easy woman must be looked at as evil and conniving until she proves through long experience that she is not. You must be patient.
It's always best to stay abstinent until after the wedding. This is even more important for guys than for gals as a pregnant woman who is not your wife (or for that matter who is your wife) can destroy your life for 18 to 24 years. The woman can always adopt the baby out or collect benefits as well as child support. You have no such option. If she wants to stick it to you then you are screwed. (Child support and alimony are the screwing you get for the screwing you got)
Never date a loose woman. Never date a divorced woman (until you are certain that her husband slept around on her and not vice versa) and never, never, never have sex with someone who is not your wife. (and for safety's sake have a great lawyer draw up an ironclad pre-nuptial)
Sounds to me I was excusing neither. I think it's the responsibility of both parties to practice birth control because one of the consequences of having sex is pregnancy. Why was he having sex with a "cruel, manipulative woman" to begin with?
It's not like they were marooned on an island.