Okay, the part about understanding some social aspects but seemingly unaware of others, that sounds possible Aspie, as well as needing a lot of alone time. About sexuality you might be doing him a favor if you can matter-of-factlly communicate: sometimes it can merely be good and great is what happens unpredictable time if we merely let it. Like riding the zen wave, it dances upward and we just let than. That is, he doesn't always have to be "on game" and performing, etc, etc. Now, for me, sex is almost as much for adventure and it is for pleasure. Now, when I was a teenager, I really believed in the theory of swinging because it seemed a very natural answer to people's inclinations, but I have kind of discovered that I'm naturally monogamous. So, adventure means to me vivid fantasy. And I have a VERY vivid imagination. And yes, some of my fantasies involve games of dominance and submission, and I particularly like the topic of spanking. Well, everyone likes spanking (so common it's almost 'normal') Well, actually, not everyone does, but I sure do.
(Or, he just might be unsure of social signals, not want to be a pushy jerk, and prefer the woman to make the first step and make it reasonably clear what she's interested in)
Well, I really think if you gave him permission not to be a "star" all the time. Permission, gently and matter-of-factly given, to explore his fantasies, step by medium step. As forays, and any particular foray, well, it might work out and it might not, and either way is perfectly okay. I think that would really build your relationship and teamwork.
========================
And you might underestimate how much alone time he needs by an order of magnitude. I mean, when I was a teenager, I got way into religion, it didn't work out. And I was so far into it, I had to come out the other side. I had to think through it and decide it probably wasn't true, and that was real scary and real hard intellectual work (and hard emotional work, although I didn't realize that at the time). It took a lot of walks, a lot of bike rides, a lot of sitting in my closet alone or in the garage, reading or trying to write honestly.
I have similarly gotten into academic ethics (utilitarianism, Kantianism), peace activism, politics, tax policy, etc. Each one feels like really big issues.
(So sometimes I have all this going on, and I've tried to share at various times but people weren't really interested or acted like it was weird, and so, yeah, I suppose sometimes I do come across as secretive)
And I bet your boyfriend might have some contributions to make regarding history.
A 'perfect' day for me is a lot of intense intellectual work during the day, and social at night. And sometimes the intellectual work can go over several days and then I need/want social.
Of course, all Aspies are different. And your boyfriend may not be Aspie, he just may march to his own drummer. In either case, more power to him!
And by the way, welcome to our group here