I like stretching, it feels good. Sometimes being naked also feels nice. The person who decided to invent naked yoga was probably hailed as some kind of genius by people who loved both those things and could think of nothing better than doing both at the same time.
It's a bit odd, to me at least, to see people start to get worried and confused or even concerned by the fact that these all-male naked yoga classes exist. Whether they, like Joshua Stein, editor-at-large for OUT Magazine, who attended a class in 2008, say that real yoga can't be performed in environments with such "heightened sensuality" or whether, like Mary Dillion, they don't see why you need to go to a class to perform naked yoga, since you can do it at home, some comments about the classes aren't making much sense.
Firstly, it's not exactly a secret that a lot of men go to yoga classes to be surrounded by beautiful lithe women*. Also, just because you** can't see why someone would enjoy naked yoga, doesn't mean others can't enjoy it. After all, they're not you. Not only are you not under any requirement to enjoy nude yoga, you're not not under any requirement to think it makes sense, since whether a bunch of other people enjoy stretching naked with a bunch of other naked people doesn't affect you in any way if you don't want it to.
If it turns out that these naked yoga "male-only gatherings tend to be more popular and have become a mini-phenomenon in the gay community" and that they are actually an excuse to get intimate and naked with a bunch of other guys, then so what? So's football.
* Or at the very least, it's a strong stereotype that society has no issue with, so long as looking remains just looking.
** And by you, I don't mean the reader, I mean the literary technique you.