Threesome

I am sure that ANY guy would happily join into a threesome (2 girls and him). But then it occurs to me that there has to be someone who wouldnt want.

Which confuses me further. What non-gay guy would refuse a threesome??? Especially if lets say his gf was in on it.

>>1
What's so great about a threesome? It's one of those boring porn chliches that men apparently "must" be turned on by... like by women wearing high heels and stockings... or lesbians... or cumming on her face... yawn to the max.