Meh, there’s a lot of ways to dress it up but it boils down to:
Have sex more or the partner with the higher sex drive will feel neglected. This doesn’t necessarily mean PIV sex, but sexuality is a part of being human and isn’t something that anyone should have to sacrifice.
It’s kind of an unavoidable reality and people will beat around the bush about it, but sex or lack thereof can make a bad relationship or break a good one.
No matter how you dress it up, one partner isn’t having their needs met.
Tangential and purely personal experience, but the sex stopping in a relationship has always been a surefire indicator of underlying problems, in my experience.
It’s also just an inherit problem with monogamy I feel “You can’t have sex with anyone else ever” “Ok can we have sex” “No”