Cover art.

You've probably heard the old adage, "Don't judge a book by its cover." Well, I do it and you might do it too. In the end, the cover of a book ultimately matters. Yes, yes, the writing and the story are important. However, for readers to judge the merit of your book, you need to first convince them to put in the time to read it. And this is where covers come into play.
For me, this is a place that I struggle with. I like super sexy covers that let you know you are going to be reading the steamy things. At the same time I don't want someone to be holding a book with a half naked man on the cover. So back and forth I go.
In today's world, readers are slammed with images, all vying for their attention. Physical bookstores and online ones alike display dozens of titles in any one genre or style, all of which will seem interchangeable to the customer they target. How do you increase the odds the book they pick is yours?
This is a good question and I have not found the answer. 
As it is, right now I just choose what feels like the pictures and designs that capture what this book is about. Its the best I can do without a huge marketing team behind me. 
Honestly, I think the blurb is what gets the reader to take a book home, but I could be wrong. I have never chosen a book purely on the cover art alone. I have to read the back.
Do people just choose a book by the cover? If they do, I have not met them.