Well all of it once the woman has her cunt opened up. I have fucked several virgins in my day and many non virgin cunts. I find than about half of the non virgin cunts I have fucked only had about half their depth i opened up. The first time it happened I heard the chick grown and ask what was that. I took your inner virginity. They admitted they hadn't really enjoyed sex and had difficulty having vaginal orgasm. A six inch deep cunt is normal.