Gay Men- Sluts?

How ok is it to be with someone, and lust most aggressively after another?  That you flirt but also take it further? Is it ok for a gay man to grope?  To undo zippers and fondle the guy you admit you lust after, right infront of your bf?  If its about sharing sex with your partner and another, would it not be hot to share these acts with your bf?  And not secretly, deliberately do this infront of your unsuspecting bf?  Or is that you like to do these things, see how far you can get?  Is that you want it for yourself, and do you really want to cheat on your bf, infront of him?