Not everybody is comfortable being naked in front of others generally, and that's okay, but straight men who genuinely fear the possibility of simply being visible to gay men need therapy. The assumption that everybody is just going to be ogling everyone else just doesn't hold up to reality where there's a very long history of people being naked in locker rooms, showers, bath houses, beaches, saunas, etc. while still being polite and respectful of each other. That isn't to say that rude people have never existed, but that is far from the norm and nothing to be fearful of.
I guess it depends on what you mean by "pursue". If a person knows that somebody is not attracted to their sex and that person still asks them out or hits on them that's just plain rude. I 100% agree that's wrong. Nobody likes that.
Asking out someone before you know how they feel about you (and the rest of your sex) is perfectly normal and sometimes that's going to result in a gay man asking out a straight man and that's okay too as long as that person backs off after getting a polite decline. I personally think it'd still be weird/rude to do that to a stranger while one or both of you are naked, but it probably does happen in places where people are more comfortable in that setting.
