Why does my boyfriend of 2 years not ask me for a normal selfie but only sexy photos with my face shown?

So me and my boyfriend have been together for 2 years. I am attractive and he is insecure with his own looks. We had lots of sex and stayed together however he does not ask me for my normal selfie photo. Every time he asks for something sexier. At first I used to send him photos without my face shown but then after I had explicit photos of him I sent him ones with my face shown. He keeps insisting that I show my face because it arouses him but why on earth doesn't he ever ask me for normal selfies?
Why does my boyfriend of 2 years not ask me for a normal selfie but only sexy photos with my face shown?
Post Opinion