Originally Posted by Hazzle
Nope, I don't think that works. Notice that Pyg's first kiss with a guy was before her first kiss with a girl. The gap is born from the fact that the first kiss is usually later, not the fact that sex is usually earlier.
I like your thinking, it makes sense, but the imperial evidence so far gathered suggests otherwise.
I just think that in the scheme of things, the risk involved with intercourse for breeders has a lot to do with the gap. For the non-breeders, I agree that the hesitation comes from social mores and that once the first barrier is broken, it is easier to take that first step.