Vsauce has a great video on why we hide our genitals, which in short is mostly to prevent the spreading of disease caused by human excrement, and emotions like shame preventing people from being butt naked in front of other people.
Though that doesn’t really apply in art, and I think it might just be an instinctual disgust.
Just use a VPN service at that point. VPNs also have the upside of your ISP not being able to see you visiting piracy websites.