I get real turned on when thinking about my man watching porn

i dont kno is it normal that i get really turned on when thinking that my man is watching porn ? even when he isnt..everytime i think about my man checking out another girl or watching porn i dont know but it really turns me on and makes me wana play with myself cause its a major turn on and i never was like that before but with him i am ..so is it normal? and should i tell him about it ?