The appeal is hard to describe, at least for me, even though I am not gay (confusing given the follow up to this statement), I really enjoy how cocks look. They just have a nice sexual appeal to them that I can't really enjoy when they are attached to a guy, but when you've got a chick with nice round facial features, and a feminine body, the cock accentuates them in a really attractive way. So I guess unironically it's the "it's less gay" answer.