If your bf had a higher sex drive than you and he was bi would you be ok with him having a guy friend that he messed around with sometimes?
Think about the frustration and conflict that would arise if he was always trying to have more sex than you wantes to have. You would lose appreciation for the good sex that you do have and eventually grow to resent him. You would criticise him for not valuing you for any thing more than a sexual partner. If he had an outlet for some of his excess sexual energy in a way that doesnt threaten your relationship it seems like it would make room for a healthier relationship.