Helps to fool women into thinking you both came in unison. I've faked a lot of multiple nuts in my day. Helps them to think it's so good you just wanna stay in it and they let you stay in it as long as you like (like till their pussy is throbbing afterwards, but they love that you love staying in them and busting nuts and you get cred for keeping it up after multiples). Best of both worlds...stay in all the ass you want and they think they can pull 5 nuts outta you so they go for personal records.