This reminds me of a funny story.
I was training once with a chick visiting from brazil. She was very good but still a girl so i was going easy. letting her work sweeps, mount, escapes etc.
Well I was in mount and rolled to guard, swept and started to let her work open guard. I looked down and noticed that her sports bra had shifted and her one titty was exposed.
I sort of postured up and disengaged, I let her know and she looked down at her breast, then looked me square in the eye, and with her heavy brazilian accent said "what's the matter you've never seen one before" with that she slapped on a very tight triangle. I was so shocked I almost got choked out. I tapped, then she let go, fixed herself, looked at me and said "I win"