You have a few options....a price that you require to do it on cam (which might be high or it might be low) or something similar to what others are doing. Be aware that not all sites permit it. Check out the link below for a list of sites and what the do and don't allow (I've checked and the link is legit).

https://docs.google.com/spreadsheets/d/1vuwKN-yuOJDlLiOa8CyCVA8BMpXg7knCZxS8YgFE98Y/edit#gid=0

Honestly you should not want to do that on cam. Most good sites do not encourage it.

Pee isnt allowed on most camsites, you are risking a ban so would not recommend doing that.