Most porn focuses in female body because that is what it turns on heterosexual men. Female sexuality is catered by pictures of men like Chris Hemsworth or even "slash" (man on man action). Heterosexual women like to look at men. There is plenty of fanfiction that proves this. As usual, internet can provide of plenty of examples and fanfiction.

But if you want to see plenty of images of naked men, I can assure you that you can easily find them. Even in art. Although chances are that the idealized bodies might cause insecurities like we have, so take it with a grain of salt.