Well, you've come to the right person. It seriously freaks me out when people see a connection between romantic and sexual attraction, or are able to have a simultaneously romantic and sexual relationship. Of course the concept of romantic attraction in general is bizarre, but...anyway. Yeah, a lot of it's based on looks. As someone else said, I can find lots of people aesthetically attractive (including girls), and the entirety of the much smaller group I find sexually attractive is within the male part of the former group. I don't know how to explain to aces what makes these particular people sexually attractive to me, but I know they tend to share some common traits. See, I'm emo trash, so I go for that whole look, you know what I'm talking about. I have a pretty specific type, but it can vary a little. Some things which can add to my attraction to someone are their personality/behaviour--let me clarify, I don't conflate platonic attraction with sexual either; though they can be simultaneously present, they're unrelated--I mean if I find something hot about the way they act. Similarly, interests/talents, like how I find so many band members hot. As for how it manifests, sometimes I do just think 'he's hot, I want to make out with him/fuck him,' but even then, I'm not really, like, thinking about it; it's more of a feeling. Now, I may sound like the stereotypical misconception, you know, very sexual, all about hooking up, but if anything I might be less sexual than the average person, and I'm actually virgin, by the strict definition. My strong friendships are among the most important things in my life, not to mention that I enjoy my own company; sexual attraction and interaction is just something kinda fun, really not a big deal.