Having more sex will lead to smaller penis.
As one sex’s genitals change the other’s evolve with it. The terms used for whores ”easy” no work and ”loose” well this is going to lead to a smaller wider penis. It’s also behind the rise in anal and oral.
University of Exeter:
Dr Megan (Good) Head (Sorry)
“It takes two to tango, so when changes in shape in one sex leads to corresponding changes in the other sex this is known as co-evolution.”
Dr Paul Hop(big)wood
“Although we don’t know the ins and outs of how these genital structures relate to the reproductive success of each sex, our results show that sexual conflict over mating can lead to co-evolutionary changes in the shape of the genitals.”