Let us stand in nature.
Remove the cultural layer.
Facing each other stand a man and a woman. Naked. Without a contract, without a code, without obligations.
The woman arouses the man and he does what he naturally needs to do.
Because nature does not forbid him from doing it. He does not forbid himself either.
Because he knows that he is a child of the Earth. That the strength, masculinity, biological advantage he received from nature.
Is he evil after the sexual act?
No. He used his own nature.
What is natural — is it good or evil?
Remember this scene. This is point zero. Your natural state. Because now we enter culture. And you will see how far away from it you have been taken.