Can you please provide some type of citation for this. I’ve never heard of this aspect and would like to read more about it.

It is thought that fertility rites and perhaps even massive prehistoric orgies took place during sex festivals, around the time when the Venus of Willendorf and alike pieces of art were made. These statues are believed to have been smashed by prehistoric people amidst massive, orgiastic sex festivals as a way to celebrate their sexuality. These festivals were also carried out, of course, in the hopes that they may help to increase fertility.