At my ex-wife's pool, her friend was swimming and her friend's much younger sister pulled the older sister's top completely off. Then they fought like sisters for a while, trying to pull the rest off. It was actually quite annoying, regardless of the fact I saw the older sister totally naked at one point. We never invited the younger sister over again. I actually looked away most of the time, and I felt quite badly for the older sister. I am not sure what was wrong with me that afternoon.