Signed up for a Pornhub account

My boyfriend signed up for an account on Pornhub (the free version). I never care if he watches porn, heck, I watch it. However, our sex life has diminished. I understand sometimes it's easier to just get off with yourself instead of your partner from time to time. It's normal! I had to use his email to print an invoice, this is when I noticed he signed up for a free version of Pornhub. (At least I believe the free version).

Why would one go through the trouble of making an account on a porn site just to watch porn? From my knowledge, he has NEVER in the 8 years we have been together joined a porn site.

Can anyone please share their thoughts on this? How would you react? Yes, I do plan on talking to him about it but I don't want to overreact if this is normal for a lot of ppl.