I'm having some real difficulties understanding this. First of all, if it comes to a third base, he's more of a player than you've weeded out at first and second, which is the vast majority of men. So it's not as if you see a man three times and then suddenly are addicted to him by some glandular chemical.
Moreover, what does oxytocin have to do with anything? I don't recall bonding with my obstetrician over a tall draft of oxytocin. On the contrary.
How do men bond without tides of oxytocin washing through their bodies?
Secondly, males have oxytocin, too. (Just as females have testosterone.) Just in different amounts and different ratios.
Third, many women DO bond with their obstetricians. It is a well-known professional risk. It's one reason why many male OB/GYN's make sure there is always a female health professional/colleague around, so that they're not constantly alone in small rooms with sexually exposed and emotionally tenderized women patients.