I'm sure they are unhinged to some extent. But I've also come to realise over the years that a lot of it comes down to different priorities.

Ask a number of men what their dream women would be like, and odds are you'll get more descriptions of women we'll sleep with, than will want to stay with long term. Sometimes we'll even known this and still opt for the short term payoff, even if we "in theory" want the long term payoff, because impulse control is hard.