Even as an asexual, I really appreciate classic paintings and statues showing nudity. There's just a sense of normalness- hardly any of them are meant to be seen as sexual. I think it's beautiful to see all of these different body types represented so beautifully. That person is just chatting to their friend. That person is picking flowers. That person is welding a weapon. None of those things are inherently sexual or arousing. But they are often portrayed as naked.
Sure, seeing genitals even in art sort of grosses me out, I don't like seeing that stuff at all. But seeing the entire human body represented in such a casual way makes me feel so much better about it.
I also think it helps to make people more confident in their bodies. You must have seen those statues of Aphrodite, Goddess of Love and Beauty. With her stomach rolls and smallish boobs, I have heard so many stories of people saying "Wait. She looks like me! We have the same body! I'm beautiful!" (have you seen the original Tumblr post about this?). Seeing yourself reflected in these beautiful intricate paintings and statues, its so magical.