: Research indicates a curvilinear relationship between age and sexual function; for instance, certain issues like early ejaculation may actually decrease until around age 31 before potentially increasing again later in life. Evolving Preferences in Mature Play

: Studies by researchers like Masters and Johnson highlight that the vagina naturally adapts to fit the size of the partner, meaning sexual satisfaction is rarely tied strictly to anatomical dimensions.

: While the penis does not biologically "grow" with age, shifts in body composition—such as weight gain around the pelvic area—can make it appear shorter.