No worries Grinch even in RL I'm very open if asked. My first marriage was sexually dull because XH1 was a prude (he hated oral sex, even receiving!) but we had a lot of sex and with XH2 (who I always refer to as XH) we had what I thought was a great sex life - probably three times a week after 15 years but sometimes none for a week or so then a glut - depending on work, travel etc. Then I started studying while working full-time - that's when sex really dwindled as I was working all weekend and we died. I really believe that sex is relationship glue.
In my most serious post -XH relationship where we attempted to live together we had sex at least once a day, usually twice... with recent ex, when we were together it was two or three times a day - sometimes we never got up! I'm quite hedonistic and so was he so we were a bad influence on each other god I miss him so much.
Thinking about it I've always had a lot of sex in my relationships so there's not been the mismatching you mention. I need my partner to be adventurous though with a bit of kink.
If I did find myself in a relationship with someone who had mis-sold himself as my ideal man and then morphed into a fish cuddling, football watching potato I'd leave him. The one thing I've learned since XH is to not be scared of being on my own. I'm more scared of being lonely within a relationship as that's horrendous and I know I'd be gone long before that happened.
For me the one-door relationship isn't an issue sexually it's day to day compatibility that's my issue. After recent ex I've come to the conclusion that it's the his 'n' hers baggage that has to be compatible.