The rule guys stick to when asked the dreaded question by a new girl, "how many sexual partners you have had." He wants to give a good number, if he says too few she'll think hes inexperienced. If he says too many she'll think he's a man whore. The rule, if you slept with less than 7 round it up to 7. If more than 11 round it down to that number.
Bobby: Tina asked me the dreaded question.
Tim: Did you stick with the 7/11 rule?
Bobby: DUH, I'm not an idiot.