Is it normal i'm turned off by porn after an orgasm?

I'm a straight female with a boyfriend and a decent sex life, but I find it really hard to get off with someone. I like porn in my spare time, and the porn I like is girl only porn as I don't like the whole male pleasure focus on normal porn.
When I get off to porn, I'm instantly totally un-attracted to whatever I've just been watching, and will turn it off straightaway and go about my business.