My wife's been very consistent on this question. Her experience is: one gangbang with 7 guys, and quite a few DPs with her two male roommates. She says her dream is 4 or 5 guys. She wanted it on her back, with one guy on each breast, and one in her. When the guy in her loses it and cums, the guys rotate. The extra guys are there to replace cocks that go soft, so the fun can continue. I'm not present is her wish.