Dear desperate wife,
I wish there was some way I can tell you not to take it personally when your husband watches porn. But you are his wife who feels that it is her duty to satisfy him and now you've found evidence that he has other means to do it.
Guys will be guys. If the way he relates to you hadn't changed, if he is still showing affection, attraction to you then it shouldn't worry you.
Just a thought: how do you know he hasn't always been looking at this stuff even before you were together and that's just his thing? At the same time, you are all that is normal, sexy, loving in his life.