@Aether Why would you as a man be the one to plead for an open relationship? Unless you are some sort of Giga Chad and have women falling into your lap, you are going to be hard pressed to find nearly the same success as the average woman finding easy sex.
Usually it is the woman that suggests the "open relationship" because she just wants to have sex with other men without technically cheating, so this is quite the odd case. He is clearly clueless.