Sounds like your friend, needs help, along with you if that's " your friend ", gets baptized and drinks, watches tv??? ..Then he can't resist and you watched him have intercourse with his " prostitute " girlfriend, did you buy sex from her that night to?? Adultery? Sounds like a orgy or something your describing ... Sounds like all involved need to commit themselves to Jesus, don't think water will help here either...
You should repent of this and ask his forgiveness.