People recruited from STD clinic for study; on average, the males of this group had on average 21 sexual partners, and the females had, on average, over 500 different sexual partners in the last 6 months. THIS WAS IN 1994 - BEFORE TINDER!!! Now the ease and availability of orgies is even higher...

https://joopvanderpligt.files.wordpress.com/2014/03/vdvelde-health-psy-1994.pdf