Basically, a woman's vagina is 8 cm, so 8 cm is enough for a dick when she gets an erection.
Rather, thickness is easier to get a feeling of insertion than length. And this also doesn't have to be above average.
Rather, 20cm dicks don't fit all of Japanese people's body shape, and they just hurt because they force them to poke the vaginal wall instead of stimulating them.
I'm 16 cm and 5 cm thick, but if you insert this completely, most people feel a different pain,
People with little experience and people with narrow vaginas quickly rub and feel pain.
Anyway, if it's 8 cm, you won't be able to enjoy the stiffness of the uterine mouth, and if it's about average thickness, most women will feel loose.
You won't get the feeling of rubbing the hole, so to be honest, I feel sorry for people with average dick.
I feel sorry because I will "update my dick" even if I have an ex-boyfriend. In that sense, I'm jealous of 20cm dicks.
It's just that I can't put a long and thin dick completely, it just hurts, and I feel sorry for it.