You should make a hideable section like physical information at the profile. People could upload pictures from their cock, vagina, breast and so on and fill in information about their size and that stuff. It could be a little bit similar like the verified profile section with the differnce that people doesn't need to show their faces and can so protect their anonymity.

The main advantage is that in case we give people a place where they can present their penis the amount number of dick profile pics would be reduced