Am I over reacting

Okay so my SO and I will be laying in bed and a scene would come on of a woman in lingerie or naked, my man puts the pillow over his lap and when I pulled it off he was hard..  I don't see how it's respectful to be getting hard on's from other woman but that's where I need yall's help, what would you do. Should I be pissed that he gets a hard on off of a movie or what??