Should I be worried?

A guy I met said he had a sex addiction. I was aware he had a colourful past, but I was only just made aware of this. He says he's satisfied with sex once a week in a relationship, masturbates regularly and watches porn lately.

I don't even get the impression he's being dishonest but i don't know if this addiction is something that can just be put to bed or it could reoccur.