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I think the main reason is the unpleasant fact that desirable women under 30 like to have fun with attractive men (men that create a lot of interest amongst younger women and can exchange them frequently), which from 90% excludes all engineers. Once the age issues hit women, they look for reliable and stable partners that would consider them a win at their age, for which engineers are prime candidates. Sorry for being cynical, as a photographer I handle a lot of desirable women and talk to them about what is important to them at various ages, and as an engineer can observe this basic dynamics - i.e. a no-longer super attractive woman rejected by most desirable men because her attractiveness falters hooks an aging engineer that had a crush on her while she was in her prime, and stays with him due to a lack of better options and desire for some stability, while he is happy beyond measure to get such a (formerly) attractive spouse.