What a strange way to have sex. No spontaneity, no waking up horny, just restricted to a certain day, ridiculous? He is correct no sex is extra because it is an animal instinct, especially if you are together.
My former partner knew that I woke with a hard on every morning and we would sometimes start the day with full-on sex, or if she wasn't up to it, she would still toss me off to completion. She knew that would lessen my likelihood to look at someone else during the day and go for a 'short-time' whilst I was out.