Sex is like any other pleasure insofar as it's subject to the law of diminishing returns when done in excess.
This is the hedonic treadmill.
https://en.wikipedia.org/wiki/Hedonic_treadmill
It's also a big factor in why happiness plateaus rather than continuing in a linear fashion with money.
It's also why today's liberated young women who have phones overflowing with prospective tinder hookups aren't necessarily as happy as you'd think. It's also why having more and more channels and instant streaming options of movies and music doesn't necessarily make you happier. When something is available in endless quantity with little effort required to obtain it--it no longer seems to hold the same value.
The problem with the "american dream" is that it is built upon a lie rather than a truth, that more and more "stuff" will bring you happiness. That is what George Carlin challenged, and I agree with him there. It's also true, though, that when you start out in life with nothing that it's pretty much impossible to know this. It's a lot easier to know it if you become successful enough to afford all the things you once dreamed of and learn that all that glitters is not gold.
So American culture is, IMHO, stuck in an immature state of development. It's fine to want to attain financial security but all of this "I wan i', I got i''" is just plain immature, psychologically and spiritually. Ariana Grande lives through the bombing of her concert only to produce a song like this which suggests she learned absolutely nothing in the experience:
https://www.youtube.com/watch?v=QYh6mYIJG2Y
725 million views are proof positive of where we are as a culture.