So back before the Incel shitstorm and the time when people where just refereed to as virgins and had not yet built up a complete identity around not getting laid, there was a book out from one of the founders of OKcupid Christian Rudder. He explains the the 80/20 principle.

Mostly im posting it here since its basically the explanation given by their founder and head of analyzing the data, and in the middle of an interview about his book etc and before the 80/20 principle became so bastardized.

36 minutes into an hour + long interview he explains it