<human>: Can you condense the text into three sentences or less?

Sorry if I don't make sense as English is not my first language. So my bf and I have been together for 5 years and have been living together for a year. I work 5-6 days a week and have Sunday's and sometimes Tuesdays off. I work long hours from 8am to 6pm and get home around 7 or 8. I am always willing to have sex with my boyfriend when I get home however I notice that he doesn't feel like it.

 When my boyfriend masturbates to porn he is not in the mood for sex with me. However when I have sex with him he is still able to watch porn after. I also get uncomfortable that instead of watching porn (as in videos made for porn) he would rather masturbate to girls twerking on vine or looking at celeb asses. Videos of girls on vine etc make me feel like they are videos being sent to him by other girls and he is masturbating to them. I know it sounds weird but I can't really explain it well.

Anyway I was just wondering if this is normal for other couples? Am I just being really insecure? I don't quite understand as I don't need to get off by looking at other men and their dicks because I can just have sex with my boyfriend. 

I have told him about how I would not like him to masturbate while I am at work because he is never in the mood to have sex when I get ho.e. he says he understands yet continues to do so.
<bot>: boyfriends masturbates to girls twerking on vine and celeb ass pics while I'm at work and isn't in the mood to have sex when I get home. Is this normal for couples?