I was in the same boat. I was married for a long time to someone not adventurous in bed. Eventually we both amicably separated and I went on to one kink adventure after another. I got pegged by a domme not soon after and it was amazing. That orgasm was like no other. I started dating women more sexually compatible and it was all good from there. Don't get me wrong. Not advocating leaving. Just sharing my experience. There were other things that could have been better in the relationship. The grass isn't always greener on the other side. Anyway, watching a pegging video with a dildo in your ass and your imagination might be the next best thing.