Contrary to the media image, size is not everything. The average length of a male penis is around 6 inches and this is the sort of length that women are comfortable. There are a lot of women, some even advanced in age who do like penises over 5-6 inches. The average depth of a vagina is 5.5 inches, but it can expand during arousal. Women will be able to take different sizes of penis or vibrator depending on their own physiology. It comes as a surprise to many that a lot of women actually buy small vibrators, which are typically 5-6 inches long and slimline. They are particularly popular with young women who are virgins.