My wife made me a proposition for a , should I say ok to it?

My wife moo moo lovins' says we can have a , but the other person has to be a man. Why should I agree to this you ask? Because she says if I don't, my allowance is on hold for a month. She says I don't have to deal with the guy, but told me to bring lube. His name is Rufus, and I'm a bit leery. Do they make some kind of protector that I can lock on for safety?