Slavery is not OK. Someone indentured for owing a debt can be compelled for a maximum of six years and goes free in the seventh, with no payment required from him.
I've heard that a non-Mensan asked a Mensan what it's like at a Mensa event. They replied, "If I have to explain something during a conversation, I only have to explain it _once_."
He did give us a manual. He very clearly says that slavery is okay and eating shrimp is a sin, and lots of other rules.