Part of compatibility is having reasonably well matched libidos. It doesn’t matter if that’s a high libido or a low libido, as long as you are both the same. Attempting to initiate sex and being turned down over and over can be soul destroying, for men and for women. The subreddit ‘dead bedrooms’ is full of sad stories, rejection erodes one’s self esteem.
But if you aren’t compatible, separate.
I do not believe it it is possible to sustain a truly loving relationship with a partner, who should be your partner in everything, whilst having intimate sexual relations with someone else. I wouldn’t want to be sex partners with someone who had a life partner or vice versa. Or any combination of those roles.
Other people will disagree with me, of course, but the bit that matters is whether their views are compatible with their partner’s views.
For me, love is mind and body, best friends, best fucks. Forsaking all others. I couldn’t be with someone who didn’t feel the same. We’ve now got such a solid connection that while we both hope our sex life lasts forever, if it fades due to illness or old age, it will never feel like rejection.
My husband is the hottest man in the world. To me. He probably just looks like a slightly above average 51 year old to everyone else.
Mind you, it took 2 goes at marriage before finding true compatibility with husband number 3 