As men and women do the cishet dance with relationships and intimacy, one of the hardest things to come to grips with is the rigid man-box views on masculine sexuality.

Traditional roles in intimacy flip-flop (in all relationships), with the biggest limiting factors actually coming with women, where fear and safety are a critical concern (even if religious).

If not communicated openly and vulnerably by men to women, as the relationship ages (or gains experience) the hot flash bang of male desire and sexuality fizzles out.

Over the entirity of the relationship, just like men need to communicate and support and earn their wives/partners trust, women need to help strengthen their husband/partners ability to keep male desire up.

One doesn't have to do this (i.e. follow everyone is responsible for their own motiviation), but the issue is true equality and respect means the male desire and "certain biological parts" and heart is owned by the wife, and in reverse the husband does the same in return.

This is rarely done, and obviously when one cheats, they have given up.

For couples with privilege (including religion) it is really critical that every desire and need within the bedroom is met as long as the privilege and enthuastic consent is done. If partners come in with restrictions (albeit trivial ones [e.g. nothing truly criminial]), then the trust is not there, and as such the initmacy will be lacking and will fall down.

A point example, is if the Christian husband prefers to sexually submit to his wife, and this bother's the wife, and she says "no".

Realize at this point, the wife is starving the husband sexually and if other things are not found to help and communicated, then she is not honoring his needs, just like a man failing to ensure his wife orgasms in return.