What's on a book cover?

Now we all know that in spite of what we say, "don't judge a book by its cover", that we all do. Speaking of which, let me tell you a little story.

I had this call with a man for a radio interview.
Anyway, the guy is a marketing guy and when we chatted about the cover of my book, he stopped me and said, “Wait. You have a woman’s butt on the cover of a book?”
Of course, I answered, “Well, it’s not her naked butt. She’s wearing a bikini.”
He went off. He thought it was terrific! He said, “I could make you famous on that idea alone.”
HA!HA!
So then I said, “The second book will probably be similar only she’ll probably be in a tight-fitting snow suit.”
He laughed and said, “OH MY GOSH! A series of butts on book covers. That’s genius.”

I have to say, I never realized there are no “tushes” on book covers. But (no pun intended) it sounds like it was a winner of an idea.