Just a thought, but you might try looking at schools that have a strong sexuality researcher with a "flexible" program. Although sexuality is not my main interest, one school that comes to mind is univ of Vermont. It may sound out of the blue, but if you go to alessandra relleni's (i think thats how you sp her name..) web page on the psychology department website. The psych programs at uvm really give their students a lot of autonomy in their interests. Yes they should fit, but looking for schools that advocate for their students to study something that is a bit of an "off shoot" of what they do may not be a bad idea. Plus, uvm is in a really liberal location, so i'm sure people/the dept would not be shocked at the asexual/sexual orientation interest you have. Hope this helps, and good luck.