Sex is for procreation; even when done for sport, the biological studies show that changes happen hormonally that increase the chances of reproduction. Ergo, even when you don’t think sex is for reproduction, nature made it so that it is.

This is a strange take.

Sex is - barring IVF - required for procreation. But saying that sex has a purpose implies a creator. And once you require a creator then you're off in the land of theology and biological studies take a back seat.

This is a strange take, evolution resulted in sex as the means to creating the next set of offspring.

Evolution is a process. It can't assign a purpose to anything, because "purpose" doesn't exist outside the minds of people, similar to "justice" and "hope."

The "purpose" of sex is whatever we choose it to be.