Is it normal that when ever I talk to my bf.....

Yes I am going to say dump him. He is a pervert and just wants to fuck you. I am speaking from experience. I had a boyfriend like this and he well he attempted to rape in the movie. So do not encourage him do not give him pics and try not to talk dirty to much if you encourage it might end very badly. This made me become very cold to most of my boyfriends. You should watch yourself and I would suggest cut him off. I have met dozens of men like this and they are just looking to get laid and they will take it from anyone.