I believe there is a correlation between the penis size and women's level of vocals and even women's types of vocals. This is only in general of course, in an overall view of all women. Sure, case by case it's bound to not always apply, so it's not an absolute, but in an overview I believe it exists. The main question becomes: How strong a correlation. I think there must be a fairly strong correlation. I realise other factors can come into play and with many women those have an affect that strengthens or weakens the penis size effect. I've posted before about when I lived in an apartment and how when my female next door neighbor and her well known hung bf were having intercourse she would make very loud vocals. They broke up, she eventually gets a new bf and then no sounds from her when the bed was bumping. Not to mention that her new bf would pound her very hard and still no sounds out of her(the bed bumps were quick and short with her knew bf). This is just a general overview, but I believe that: Girth is correlated with moaning. As the girth increases so does the moaning. Length is correlated with grunting type sounds. As the length increases so does the grunting. Extra girth plus extra length is correlated with groaning type sounds. Various supplemental sounds are correlated, such as "OW" (length) "OWWWWWWW" (long length) OWWWWWWWW in a moaning tone (long length plus extra girth) "UGHHHHHHHHHGHH" ( very long length) Breathing (becomes heavier as size increases) Panting (becomes heavier as size increases) Holloring (louder as size increases) Also, I believe women's facial expressions are correlated with penis size.