Hormones cannot be Faked

Hormones are created by the brain,, but a  part of the brain, that cannot be faked. 

It can create hormones rapidly, but can only alter them slowly.

I remember a play I attended in England, a theater in the round production. After the audience was comfortably seated, the lights were dimmed. When they went up, two naked actors were seen, a man and a woman. 

The play was on. And they were acting. But, as one critic observed, the Man's penis was flaccid, not erect.