Why do people care to cum together?

When people have intercourse, most of them try to cum together. Why is that so? What are the benefits from it?

They just simply want to know they pleased their partner, it doesn't necessarily have to be together. Most try to get it around the same time though because sometimes when someone cums they don't want to keep going for much longer.

when you both come at the same time it is one of the best experiences you will ever have sexually. if your a really intimate and passionate couple it will increase that intimacy ten fold

Thx.