Do there exist _any_ public porn companies in America? AFAIK, I think they are all held privately. From a cursory search, I'm not seeing anything.

Whether we like it or not, most investor money is ultimately managed by rich old dudes who want to save face around their friends and family. Since the US is prudish as all get-out, they don't invest in porn directly through the stock market.

If you want to invest in porn privately, I'm sure those companies will take your money and you can work out a payment scheme and contracts without involving the S&P.