Muman, I have seen several anti-Semite sites who claim Jews and Noahides are dangerous to Mankind because they would join to enforce the Noahide Code someday and will execute most Gentiles for not keeping it properly. So, this kind of post only feeds them. In fact, while it may be permitted to execute murderers by Gentile courts, capital punishment applied by Torah or Noahide Courts will probably never be used again according to Jewish beliefs. Many sages state that the Sanhedrin will only be validly established by Eliahu haNavi on the eve of Redemption, and that there will be no sins after Redemption comes. Stating that it should be done now, according to Torah, is simply false. By the way, do you have the source about punishment for sexual misconduct (other than adultery - having sex with another man's wife) under Noahiude Laws? A Moreh once said on a Noahide Site, that there are different opinions about other sexual sins.