The top graphic illustrates the lyrical preoccupations of Hip Hop, proportionally, when broken down by body part. The second graphic covers the representation of body parts in the alternative genre.
The artists behind the Fleshmap project have listened to 10000 songs and broken things down for us in their interactive map called "Listen", which is well worth a look, especially for us 'Spillers who like nothing more than to collate songs on a topic!
Personally speaking, and especially as it's eyes and hands that dominate the categories, I'd like to hear more songs about tummies.
And to prove the point above, here's an mp3 that mentions pussy, ass, coochie, dick, tits, and possibly more besides. Diplo cleverly steals the backing track from Peter, Bjorn and John's "Young Folks" and throws a load of filth over the top. Jobs a good 'un.
....guess what genre?
Young Folks Pussy by Diplo