Actually... (maybe it makes me a horrible person, but...) I'm kinda curious. As I always am when presented with a character that's SO different from me, that I can't put myself in his or her shoes.
I don't really have friends that are on the spectrum, or have major OCD that would effect intimacy. But even if I had, I wouldn't come up to them and ask all the questions I have. It's invasion of privacy, it's uncomfortable for me and for them, it's just plain weird.
But I am curious about physical and emotional/mental difference. Shaun did say that he wants to have sex, that he thought about it, I took it for an indication that he's fantasizing and is aroused by those fantasies. But his condition puts major roadblocks.
Or back in the days (and I guess still, but to a lesser extent), when gay men were marrying women to conform to society and having children with them. Again, physically they were able to have sex with a woman, but I'm curious what was happening on an emotional level. Can any gay man be aroused enough with a woman, how much is it taking out of him... etc
On an individual level, obviously, it's none of my business. But I am curious about it on a population level.
Can I live without satisfying that curiosity - sure. I'm not gonna google for that information for multiple reasons. I'm not gonna go and ask people about it for reasons mentioned above. But if a fictional show, movie, book decides to shed some light on that issue I won't mind it in the least.