You know who has more sex? Unmarried couples. Sex frequency goes down with relationship duration. So if you want to have lots of sex you want to go between relationships instead of staying a long time in one.
That assumes the person in question is moving from relationship to relationship quickly, as opposed to more common pattern of long stretches of time with no relationship.
https://www.psychologytoday.com/us/blog/the-passion-paradox/....