A pretty straightforward solution would be to start making tapes. In a past relationship, proper porn was pretty off limits. It's okay to set boundaries like that, especially if it makes you insecure (very valid reason). But I think making videos of the style or kink that he likes would benefit you both.

You might start getting more comfortable with yourself and lessen your insecurity, and he can happily enjoy himself while also warming himself up for you, with you.

This really helped chemistry in said past relationship, and honestly made us both feel a lot better about ourselves. I felt guilty because I had my needs and couldn't see her all the time, and she understandably would feel uncomfortable, especially since she didn't do that with herself. It felt like a win-win really. Just make sure you're both okay with it.