Either party has a right to say no. Not every time is the right time for sex with both parties. But in most cases a "right time" should occur within a few days or a week. If weeks and months pass and a good time for sex does not occur, then the couple must explore what is going on, and the low-libido partner has to participate.
I look at it this way, if you and your bf/gf love to play tennis together and after marraige your spouse decides they don't want to play tennis any more, you are free to join a tennis club and play with others. But when it comes to sex, you're shit out of luck if you're sticking to the normal marriage arraingement.
I've had an idea that the standard marriage agreement should include a clause where if one partner refuses sex for 30 days or more, the other partner can have sex one time with another person. This allows breaks for menstral cycles and most illnesses, and creates an incentive for the low-libodo partner to address whatever is interfering with their libido. As long as you do have sex once a month, the partner must remain faithful. Frankly, that seems like a low bar to meet.
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