Yes, you don’t Know. You know nothing about the rest of his character or what his life history was.
(What do you think about masturbation?)
Grave sin (as are sodomy, fornication, and adultery) particularly when accompanied by pornography. Why do you ask? Are you trying to make excuses for something?
The "anti-judgmental" attitude you seem to be displaying, and which has been widely adopted in our corrupt culture, is most of the reason we have "drag-queen story hour".
BTW, contraception and abortion are also grave sins ... just in case you were going there next.
Repent, while you still can.