I am pretty much in your same boat, Dadchats. My STBXW was my one and only, 17 year marriage, then about five years ago, the bedroom dried up pretty much overnight. I was told it was just my head, we were having just as much sex as before, but then it dwindled to once a week, once every two weeks, then once a month. In 2018, we had sex only 12 times. In 2019, we had sex 4 times before she cut me off entirely in June. We separated when her affair was outed in August. I went just over a year before I slept with anyone else.
My girlfriend is now my #2. She is 100% different from my ex in her body type. I was so nervous that, the first time, I didn't finish, despite having a blast. We fooled around for a few hours, my GF definitely got hers, but for me, the anxiety kicked in and I was, lacking a better term, pushing rope.
But since then, my gf has been an incredibly generous lover, attentive, responsive, and just awesome. She finds me incredibly attractive, which really helps boost my confidence, and I am attracted to her as well, which makes her respond as well. Every time I go to meet her, it's all we can do to not just dive straight into bed with each other. It took once or twice, but the worry and anxiety and unsurety evaporated fast. Now, I've had sex more times in the last month than I did in the last two years. It's exhausting but amazing.
The best advice I can offer is that communication, honesty, and attention are key. Make sure you are as generous a lover as you want your partner to be, and realize that they probably have some insecurities as well. My gf is a bigger girl, and she is super self conscious about her weight. I make sure that I show her absolutely how much I adore having her body under my control, and when she takes the lead, I make sure I am vocal and expressive about how much I enjoy what she is doing. It has helped both of us, I think.
[This message edited by Incarnate at 4:05 PM, July 24th (Friday)]