Well, the whole premise of the musical lays squarely in what the title claims.
Case in point:
“Why are you so rough around me? A bit crude, don’tcha think? Learn some manners.”
“I thought you liked my jokes. I thought you liked my making you laugh.”
“I want you to be careful with your words.”
“You want me to be in perpetual spellcheck with you.”
“No, really, I don’t. I don’t want you to change. Just be careful with your words.”
Or:
“You’ve got a great body. It’s perfect. I like muscle, though, athletic types, ya know? Would you do that for me?”
Is it really too cynical to say that men and women spend their lives trying to find the right mate, and that once they do, they spend the rest of their lives trying to change them? Why would anyone find the idea of a “lifelong project” appealing? What is this drive in us to possess by insisting on our stoopid, persnickety standards?