I think the issue here is that your gfr doesnt understand the nature of sex and the various facets of our need for sex, i remember once reading a problem page ( in the 70s ) when a woman divorced her husband because she found him masturbating when she came home from shopping.
As a teenager at the time, i thought therefore that when men married or were in a relationship they stopped, i was young, i had no one i could ask ( and i certainly wouldnt ask my dad !!!) so i sort of thought that was an acceptable response to finding him doing that.....................
As i got older, and talked with men more i realised that sexual relief is as important to them as breathing, and as i developed myself - to my surprise, because again no one had told me this, it was important to me to !!!! I had to overcome my learnt behaviour that nice people didnt do such things and love should be enough to sustain you......
Now i believe anyone who thinks that , probably hasnt had a good solo orgasm before !!!
i wonder if you talk together about sex and what it means to you, perhaps viewing it together might help ?? perhaps her learnt behaviour is that porn is nasty and perverted and hasnt actually viewed much of it ???
anyway, talking is the answer and possibly trying to live closer !!!