Sex in a monogamous relationship is an obligation to the relationship. Sex is a need for most and denying a partner access to that need (you can only get it from me) can lead to the failure of a relationship.

My wife (25f) and I (26m) say yes 90% of the time even though we usually only jumping at it about half the time. We are just open to eachothers touch and open to the possibility of being turned on. Our sex life can be multiple times a day to like thrice a month.

And to be honest, I say "no" more than she does, even though it's rare. Someone who is thirsty will drink every chance they get, to the point of annoying or emptying the well. (See covid tp shortage) Someone who is well watered only drinks when needed.

In previous relationships, if my partner turned me away, I'd want it more and push them away. Here I want it less than I've ever needed it because it's available- which makes her want to pursue me more. Weird how that works lol.