Hello there,
I have been practicing yoga for about ten years now and have been in some racey situations. This should not be surprising considering that we have a position called "downward-facing dog".
I'll start off with one from a few years ago. I was changing next to a lovely redhead with a nice figure and a pretty big bush. To my surprise, she just slipped on her yoga pants with nothing underneath. This was before the big thing about sheer yoga pants was in the news, but it still caught my eye. Don't mean to be rude, I said, but I'm surprised you aren't wearing anything underneath. She said that undies make her uncomfortable doing yoga, and she knew that the pants weren't see-thru. In the locker room, she seemed to be right.
I was wondering though, so I put my mat right behind hers. Boy, was she mistaken!
When she bent over, I could clearly make out her pubes and labia. Being a bit bi, it was hard not to stare. I think I could even smell her.
I never positioned myself behind her again, because it was too distracting. One of my male classmates apparently didn't have a problem though, because I saw him behind her pretty often. Lucky bastard.