To start out with, what you're describing about your vaginal lubrication during arousal sounds very standard, which supports what your healthcare providers have indicated about this being less a physical thing and more something to do with mental and emotional components. For starters, while vaginal sex is often treated as the be-all-end-all of pleasure, the reality is that plenty of people find other kinds of stimulation work better for them. Can you give me a sense of how much your and your partner have focused on other sexual activities? For example, since it sounds like friction may be something that feels good to him (and possibly you), have you experimented much with manual sex? And can you give me a sense of how well you feel like you know your own body and what makes it feel good (for instance, do you bring things that give you pleasure during masturbation into partnered sex)?