my boyfriend

So i have noticed that whenever i go out with my boyfriend he be staring at girls. I'm okay with that lol. We all have eyes for a reason. but it bothers me that he doesnt do it in a discrete way... like if we're out eating he'll look more than once. and staring at their asses.. i feel uncomfortable and i have told him and he just denies it... should i be upset or am i being dramatic...