What are the causes for weak s in men and women?

What are the causes of weak s in men and in women? I really have a hard time believing that not shaving or waxing pubic hair leads to less satisfying . This is what I've been told, but then I'm sure that people in past eras still had satisfying lives although they were not conditioned into thinking clean shaven was the norm or desirable. So for the people who know what they're talking about, why do men and women experience weak s?