What is it about bukkakes/gang bangs...?

[Homer]

I may sound boring but I don't understand what it is that other guys get turned on about by seeing gangbangs or bukkakes. Wouldn't most guys rather see one guy screwing five or six women rather than one woman being screwed by five or six guys? (I know that this would be difficult as a guy has to wait for a while to get hard again after he cums where a woman can keep fucking and having orgasms until it is liteally too painful to carry on) Personally I'd rather be with five women rather than be with four other guys screwing one woman.