In my hey day I wanted sex 24/7, like most young men. Immaterial if the lady of the moment felt the same! I was so selfish that if she was not into it, at all times, I would soon exchange her for a girl that would meet my demands.
But as I grew older and more selective I also became more self controlled & could outlast my burning physical needs to the appropriate times and even enjoy it more! The turning point was also due to a lover that was later in life certified as a nymphomaniac. She demanded & at times commanded(!) sex continuously and I wore out and became numb sexually.
From there I had to initiate sex in all future relations to give me the contention I seeked.