I think in certain, if not most, men, there is a deep desire to see a pussy. I mean can you remember a time when you didn't. Pretending that's not who men are is I think a bit dishonest and of course is a vital part of the reproductive imperative. Desmond Wilcox the anthropologist said that the breasts evolved to look like the buttocks and the lips to look like the lips below. Personally I thought that was far fetched but maybe there is a connection.