Not sure what you're trying to say there. No studies have empirically gotten at the root causes of the gender gap. Sure, sexism probably accounts for some percentage of women deciding not to choose such a profession, but there's no evidence to think it's a predominant role.

Sounds like you may be projecting your own attitude towards women onto others, possibly? I've never acted smarmy towards female coworkers, and haven't seen anyone else do so. Nor have I ever heard them complain about such a thing. Occasional social awkwardness; some older gentlemen being a little too eager to help (not in a smarmy way or with romantic/sexual overtones or anything like that, just polite "old-fashioned" behavior); but that's about it. That doesn't mean it hasn't happened to them, but if it did, they probably would have said something to someone if they felt it was a big enough issue.

Of course, I can't speak for women in general; maybe a lot of them do deal with smarminess in the workplace. All I have are anecdotes. But your anecdote doesn't mean you can speak for them in general, either. Are there any blog posts or testimonies by women in tech who've discussed this that I could look at?