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i think it is fine to ASK about seeing him more often, but I don't think you should EXPECT it. He is 36 years old, and has never had a relationship - this is a pretty good indication he has intimacy issues, and I doubt that dating you for a few months will resolve all of them.
I would be more worried about the lack of sex drive, if I were you. Sex drive generally diminishes over time, and you are already starting out with serious problems. Premature ejaculation, which is a common response to anxiety about inexperience, could be worked on, but inability to maintain an erection is often more problematic. I would be thinking of either a physical or emotional problem because of the length of time you've been dating. Unless he is willing to pursue medical advice, I would be extremely worried.
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I think being 36 with not a lot of relationship experience would explain the two nights a week thing. He's been used to having his time to himself and his friends for all this time.....now he's trying to integrate a relationship in, and may not know how to do it or is afraid of giving up the other things in his life for a relationship. Give it time, and if it doesn't change you should probably mention it to him.
As for the sex bit, I can only attribute that to his lack of relationship experience as well, but like vash said, he may have a diminished sex drive too. Keep working on him. You said he seems to be getting better with it - maybe he just needs a chance to learn how to become intimate.