Totally agree, but the cervix separates the vagina from the uterus. The thickness allows stimulation of the G-spot located at the entrance of the vagina, but the penisFirst of all, penetrating the cervix is physically impossible. If it did really happen it would be a medical emergency.
enters through the cervix into the uterus. In fact, a man whose penis is said to be "normal" or short, is physically unable to go beyond the cervix. The depth of the vagina would be around 15 cm. "My" women like to have men up to 25 or even 30 cm penetrating them. A "normal" partner never goes that far, and in fact it's as if the bbc partner is fucking a woman you don't know!