It is so true.  Words are a powerful tool.  They are our primary means of expressing ourselves, and however we use words affects our children.

Two influential words in the human language are Sex and Love.  Perhaps the two most overused and poorly understood terms in the English language, we use them both to mean a wide variety of things.

I love hotdogs.  I love new clothes.  I love you hair.  I love my husband.  I love God.  Hmmm.

Does not compute. 
Translation:
Hotdogs are yummy.
New clothes make me feel pretty.
I think your hair looks really nice.
I would lay down my life for him.
Every fibre of my being relies on Him for my very existence.

God is not yummy!  That's silly.

Love means something different in different circumstances!

Where we use the word Sex, there is always a better word.  It is a word that has come to mean anything to do with a physical relationship, moral, immoral, perverted and otherwise.  From the get go it is important to make the distinction of what the heck we are talking about.  Marital union.   Conjugal love.  Fornication.  Seduction.  Adultery.  And so many more.  That are not the same thing.

"So and so had sex."  Such a stupid expression. 
"So and so gave themselves fully in physical union, with God at the centre, to their spouse" means something so different than, "so and so committed a mortal sin and betrayed their marriage vows by committing adultery"  !!

So, sex is used as a silly word.  A vague, nondescript word for something sacred.