I read that pornhub has a lot of female viewers. The problem is that it is a public taboo for women to say that they watch porn.
It isn't taboo for women to say such thing but they won't tell it to everyone for sure. Sex is very common conversation among women and girls but at their own society. I mean, woman talks about sex among other women
Yes, there all the talk sooner or later come down to sex. As all roads lead to Rome, so and there.

That is true, but the taboo comes when they deny they talk about sex, to other men and even women that are not in their circle, but that, of course, is changing, new generations are being born with the internet, so the taboo and stigma will disappear in 2 to 5 generations, and both men and women will be as perverted XD.