I don't necessarily think that homophobia has everything to do with this. I'm gay, but I've had sex with a woman or two - just because they started playing around, I was in the mood and found it kinky, and did it. But, under the normal circumstances - no - I wouldn't have sex with women. And I do see how people could think of it as being gross and still be ok with gay people. I've sometimes had thoughts of twats being gross, but then at other times, I'm like - well, yeah - I can see how they'd be fun too.
But I do know that many people who have said HELL NO, FUCK NO, GROSS, etc - have also eventually been entertained by the presence of a person of the same sex. Or, in fact, have previously done things and then cover them up with HELL NO, FUCK NO, GROSS, etc.
I've seen several sides of the issue. But as I've said, it depends on the mood of the person at that particular time. At the same time, however, there are many people I'm positive that go thru life and die without ever doing anything with the same sex. But as to whether they've thought about it in a positive light, my hands are tied. I DON'T KNOW. Too many issues to look at - especially when viewed in a case by case manner - to know exactly what people have considered doing.