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Electronic address: psocid res. Sex-specific elaborations are common in animals and have attracted the attention of many biologists, including Darwin [1]. It is accepted that sexual selection promotes the evolution of sex-specific elaborations. Due to the faster replenishment rate of gametes, males generally have higher potential reproductive and optimal mating rates than females. Therefore, sexual selection acts strongly on males [2], leading to the rapid evolution and diversification of male genitalia [3]. Male genitalia are sometimes used as devices for coercive holding of females as a result of sexual conflict over mating [4, 5]. In contrast, female genitalia are usually simple.
Just as women can have different sized breasts, hands, and feet, the size and depth of vaginas can also vary. According to one study, the average depth of a vagina is about 3. Other sources suggest that the average range of size may be about 3 to 7 inches approximately 7. In fact, the depth of the vagina from the opening to the tip of the cervix can measure anywhere up to 7 inches