I think this is largely a function of a culture that teaches men (and all of us) that women are sexual commodities to be consumed. Not to imply that other men don't enjoy the female form, but I really think this sort of reaction really does come out of being raised that way. I've spent time in a lot of different clothing optional spaces, and men there don't act this way. They aren't falling over chairs because they just have to visually take in every single pair of naked breasts or naked bodies. They aren't covering their crotches to hide erections they can't control. That doesn't mean they don't enjoy the bodies of the women around them, but it doesn't seem to have this same level of "consumerism" that seems to be being described here because a different culture is in play around nudity and sexuality.
Additionally, I read a story the author day written by a Muslim woman, in part about what's going on in Iran, and in it she included a photo of two young men leering at a woman who was fully covered, except a bit of her foot was showing and they were goggling over that. They were treating her as being sexually provocative and salacious - because they could see a teeny bit of her tennis shoed foot. If that's what your culture teaches you, that's how you act. I don't think it's necessarily all that different here in the US where women's bodies are both taboo (no nipples allowed) and affirmatively sexualized from a very young age.
"A report by the American Psychological Association (APA) on the sexualization of girls in the media found that girls are depicted in a sexual manner more often than boys; dressed in revealing clothing, and with bodily postures or facial expressions that imply sexual readiness. In a study of print media, researchers at Wesleyan University found that on average, across 58 different magazines, 51.8 percent of advertisements that featured women portrayed them as sex objects. However, when women appeared in advertisements in men’s magazines, they were objectified 76 percent of the time."
