Male ass. And I'm not talking just buns and cheeks. There's too much of that already. I'm talking bend over and show me the target. Why do I pick male ass? Simple:

Keyword search: male ass
Top 10 results on Google:

1 an Adult Check list of thier related "gay ass" sites, both standard and gold
2 an urban dictionary definition for "male ass muncher"
3 an AOL personal web page
4 a straight network site featuring only women
5 a straight network site featuring only women
6 a straight network site featuring only women
7 a straight network site featuring only women
8 a straight network site featuring only women
9 a straight network site featuring only women
10 low and behold! A gay site! But wait… 3 of their sites are about cock! Where’s the ass?

"Gay ass" gives about the same results. Kinda funny how the word "straight" pulls up all-gay targeted content, and the word gay pulls up lesbians and content targeted at a straight audience.

Tis a dry dry market