Personally, I find the female form more sexy than an extreme medical close up of a vagina.
A lot of the "attraction" preferences we as humans display are still drawbacks to our instinctual traits from evolution:
Looking at other species in the wild, a female's primary role is to attract a mate so they can reproduce and further their species. A male's primary role is to provide and protect and find a worthy female to spread his "seed". The basic instinct of a species is to reproduce at its core.
You can see, based on these indicators, that we as people have barely left the jungle. Women don't find dicks attractive because that isn't instinctively why they want a mate. They find muscles and athleticism more attractive than dicks. Because athleticism means strong, protection. They wear makeup and worry about appearance because its part of their instinctual programming to compete against other females to attract the best mate.
Men barbarically fight over property and women and other things they view as "possessions" because its programmed. Men find nice asses attractive because our instincts (whether we are conscious of them or not) tell us that a nice shapely ass and breasts mean that the woman is healthy and a worthy reproductive mate.
Sorry for the science lesson.
Now, that being said, I fully support us as evolved, higher thinking humans in the effort to be free to act, dress, love, fuck and behave the way we see fit, despite our evolutionary programming. Just because we have have leftover code doesn't mean we can't deviate from it. It just explains our actions to some degree, shows that we aren't really that different from apes. We just have cell phones and lattes in our hands instead of sticks.