Im having an argument with a friend and need YOUR vote to BREAK the DEADLOCK that we are in

The scenario is: For a billion dollars you have to do one of the following

A. Suck a dick, choking, gagging, the whole 9 yards
B. Get railed in the ass from behind, anal gape and all

While I understand that this is a tough decision if you are a straight male, as both of these acts are disgusting, you must choose the lesser of two evils that you would do for a billion dollars. Which one do you choose and why