I think people oversimplify sex at times.
Yes, I agree, that sex while using condoms are mostly for pleasure/intimacy/ showing trust etc, BUT
On the other hand, sex means giving life, giving seeds at the moment when you, yourself feel the most ripe, the most vital for such thing. Depressed people have low libido. Older men have lower testasterone. Older women are more tended to miscarriage.
If a woman has agreed to have sex with you, you have some self-validation.
Ok, this is a basic male sex ed and why young men feel it is so important that they get a lot of sex. However, without enough self-validation through sex, career, sports, money etc you essentally can feel ALIVE.
and that feeling is great, for sure. It may not bring happiness, because unless you have a stable sex partner, stable job, stable results in competition, you can't be sure to stay Nr. 1 or fulfill your own ego infinitely. However, it is a gratification, which is needed to search further, and it is so for many people.