One, you think nudity is in bodybuilding. It's not.
Two, you think the context of whatever Naomi is doing requires her to hang her nude bits out. It doesn't, that's her choice. It's also people's choice to not like it.
It has absolutely nothing to do with being sexy. I don't see Naomi as sexy at all as a heterosexual male. She just screams forced and faked. Those aren't sexy to me. They are sexual though.
It's all about being close to nudity for impractical reasons. Context matters and the definition of nudity matters.