I tried this a few times in college with different girls and fun was had by all.It wasnt actually tieing I wrapped them in a blanket and one in a sleeping bag.I told them as kids we would have a contest to see who could get out of the blanket fastest.I told them the record was 32 seconds and asked them to try.When they were wrapped I would pull the sheet back and stat tickling their feet out of 6 different girls only one didnt want to do it again because the said it was arousing