I am very typically aspie in most ways, but definintely NOT aesexual. I'm horny as a bull, and really enjoy sex. However, There was a time when I realized that although I had much desire, I was inhibited when expressing my feelings sexually. I think I had (well, have, actually) INTIMACY issues, and was being somewhat mechanical and not, well really getting into it in the way that you seem to be desiring. Just realizing where the feeling of inhibition was coming from really helped. Maybe this applies to your aspie guy as well? What if you enhance emotional connection, trust, safety, intimacy, clear ongoing resentments, etc.., without directly addressing sex? Might this end up helping? Forgive me if this is off the mark, just trying to help.