i had a party the other week, with about 12 guests. 4 of the guests were ex lovers of mine. we get along awesomely - two of them actively find more girls for me to shag, either sniping their single, recently-broken-up friends, or just telling randoms that i personally like what a good guy i am
if everyone involved is a decent quality person, has high self esteem and doesnt have to make the other one feel like shit in order to salve their own feelings, then yah, easily doable