Why Would A Man Want His Girlfriend To Sleep With Another Man?

Why would a man want his girlfriend to sleep with another man?

Because he wants me to experience as much variety as possible, gaining beautiful new experiences. And because he wants me to have pleasure and the strongest orgasms I can have. 

Because he wants to offer everything to the love of his life and don't want our relationship to be the end of my fantasies!

Because he enjoys seeing me as the free independent spirit I really am. He knows that I am adventurous and I am allowed to be.

Taboos are hot. Breaking taboos is even hotter. Girlfriends are not "supposed" to have sex with men who aren't their boyfriends. Boyfriends are not "supposed" to enjoy watching their girlfriends have sex with other men. F*ck the social norms! My boyfriend wants me to be my true self with him and that I live all of my fantasies!

Because it brings out my naughty side that he likes so much.

Because he loves to know that other men find me attractive.

He wants to see how I react to other men's touches and thrusts and he wants to see the look of complete devotion in my eyes when I obediently serve another man.

Because it turns him on to be in a sexual competition for his own girlfriend (also called sperm competition). 

Because he don't thinks that I am his property, even if we are in a relationship. 

Because he loves to challenge me by arranging dates with exceptionally well-endowed men that I have to please, even if it means they completely resize me.

For reasons of power: He finds it arousing when he shares me with other men.