It's just Pornhub trying to shine up their brand and make themselves look like a good, caring company, so that they get publicity, are recommended more, and chosen more. It's just a business move that won't actually achieve anything positive, and will probably be negative by making at least one part of their site seem almost "family-friendly" for teens.
I've been and looked at the "sex-ed" site, and it has multiple problems. It can't seem to decide whether it's a basic sex-ed site, (with safety, how-to's, and attention to sexual pleasure for both partners etc,) or a site with stupid tips and tricks for adults, as well as a few random basics.
It has "how is babby made" (basic reproduction,) alongside "what do people do at play parties." That blood - not the mentioned cramps, bloating etc - is what makes period sex off-putting (while advertising a disc thing to 'block the flow' 
)
That if one does not wish to engage in vaginal sex because of pregnancy risk, that it's recommended one can engage in "outercourse," which includes anal sex, apparently! I thought anal was in not out?? 
(It's also clearly aimed at men as this quote from 'outercourse shows: The obvious benefit is that outercourse prevents pregnancy without preventing fun (as long as you don’t ejaculate close to the vaginal opening). )
Ultimately, it's a whole load of bollocks, and won't do a single positive thing.