Pornhub home page has a very clear warning before you get to anything explicit:
This is an adult website
This website contains age-restricted materials including nudity and explicit depictions of sexual activity. By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
I am 18 or older - Enter
I am under 18 - Exit
