I've been to a few of these and the main problem has been that while all the girls were up for bukake during part one of the night, only little blonde Layla was up for getting shagged during part 2, so you had 15 or 20 blokes all trying to get into her while the other girls just entertained their own partners in public. More voyeuristic than gangbang.
Mind you Layla is a good act to watch......one night she had five blokes on the go at once, one underneath in her cunt, one behind in her ass, one in the mouth and one in each hand. A joy to behold. Every wife should be encouraged to watch and learn