His and Her Health

how do i get my husband to understand that his viewing erotic sites and chatting with the people, he also writes stories on these sites is hurting me.
He says he goes to these sites because I have a low sex drive. I was on tegison/soriatane for 5 years.
because i gave a skin disease called Dariers.

We have been married for 31 years. I have been more sexually active in the past 7 weeks. I found a note just this weekend that he had written to one of the woman. questioned him. He got annoyed and has told me that my lack of sex, has made him feel rejected and that he is confused and thinking of separating.

Here is a link to an article on one of our websites. You may find it interesting and informative.
http://www.bermansexualhealth.com/lack-of-libido/cybersex-is-it-an-affair-or-harmless-fun-here-is-what-it-depen.html

I'd say he is making excuses for his naughty behavior. I'm not knocking pornography or anything but if you have told him that you do not approve and he continues I'd say that it isn't fair. Try having a conversation with him about the subject or going to a therapist.