Boring husband

Me & my husband are always together we are never apart. This one night that I am away from him I ask him to send me a dirty video(I love the idea of watching him jack off), of course, he said no. He always says no. He never has! We've been together for 4 years so I don't understand. I would do it for him. He doesn't ever ask though either. Idk. Just upsetting I guess.