Question

Why does interacting in sexual intercourse feel so good?

Answer 1

Because you are with a man or woman you love, making sexual contact and it feels good. The thrusting and insertion of a man erect penis into a woman vagina feels good or vise versa.

Answer 2

Because human beings are hard-wired to make more human beings.

At one time, there were people who didn't especially like it, and didn't
really care whether they ever did it or not. They produced far fewer
children than the people who would do almost anything for the chance
to do it, and it didn't take long before there were no more of the ones
who didn't care.