Why does my partner look at photos of scantily clad women?

My partner and I, both 66, often have big arguments because I caught him again catching pictures of almost naked women in clear positions on his laptop or cell phone. He says it would be quite normal for men to meet each other I can't cope with it and become a fury, I feel like nothing against these women and feel insulted and humiliated. I just don't find this behavior normal, what do you get from the reputation of other women, it does me. Even if we're older, please understand me and please no cheeky answers.Give me advice on how to behave next time, wanted to break up.

Thanks for the star!