In (LaVeyan) Satanism you can screw as much as you want up to the point you don't hurt yourself or others. But there's a catch: in Satanism, there's no repentance, no otherwordly forgiver of sins. That means if you make a mistake (which everyone does) and seriously hurt someone or yourself, you must face the full consequences of your actions , period. No second chances. What this means is that in order to be Satanist, for all practical purposes, one must be a member of a community of other Satanists who love you and care about you. Because there is no god to fulfill that role. A lonely Satanist is a dead Satanist.