Separation of Church and State is in the same (liberal) Constitution wherein you can find A Womans Right to Abortion. or in the liberal Constitution that a Gay person has the right to be openly Gay in the military.
Just wait until the Onanists declare they want to march in an Onanist Pride Parade funded by the city, and set aside quotas for Onanists who don't engage in sexual relations with anyone else.
Will employers be required to provided Onanists with separate restroom facilities?
People who define themselves by their sex acts are an odd sort.