Christianity

Susan Blackmore is profoundly anti-God which is why this statement in her book The Meme Machine caught me off guard:
"We have largely divorced the act, and joy, and marketing of sex, from its reproductive function."

It was her use of the word joy that gave me pause. Why use the word joy? What does she mean by that? 

It made me ask the following question: 
"What is the joy of sex?"

I believe the Holy Spirit instantly answered my question as I immediately responded to myself:
The joy of sex is the guiltless, physical manifestation of the spiritual unity shared between a husband and a wife.

What do you think?