I'm sure there are times they do, but they go about the situation differently, or probably, don't know how to react to it other than in an insouciant manner. That's not to say it wouldn't make them uncomfortable, but with what I've heard from my male friends that have experienced situations like that, they usually don't know how to react. I feel like it's one of those, "well, she's a female, what can I do?" sort of things. Females are encouraged to proclaim discomfort in situations such as sexual harassment, and have been raised to expect, for lack of a better term, that men must treat them with respect. Males aren't really taught that sort of thing. There are certain behaviors we expect out of men and women, and with that said, men and women will react differently due to those differences in societal expectations.