I find it frustrating how women pick and choose like that, but I do understand it at the same time.

My ex-wife had a best friend who would let any guy see her naked for whatever reason...except me. She and my ex-wife would make me leave the room at parties when her friend was going to flash or do teases, etc, because I was "too much like a brother" to her best friend. All it did was make me feel like there was something wrong with me. It didn't help that the best friend was incredibly attractive, both physically and personality.

I did see her braless one night when we stayed with her, but that was ever it.

Did her brother see her topless?
 

My college age son and daughter separately went on spring break to Spain and Portugal with same sex friends. When they returned, they compared where they had been. It turns out that they had been at the same beach in Portugal on the same day.

My daughter had been topless on the beach and her breasts were seen by who knows how many strangers. BUT, the fact that her brother might have seen them was too much. He said he hadn't seen her there.