Michelangelo's David, some of the beautiful religious art, like Saint Sebastian, and then the warts and all art by Lucien Freud! A man's body is purposefully designed and I find it fascinating!
I’ve got David as my profile pic. I look so like him (ha ha). Worth a trip to Florence to see. Don’t fancy being San Sebastian though. Lucien Freud! No - you want Henry Tuke for the best male nudes.