I can orgasm instantly when i see a certain facilal expression

I'm a girl and when I touch myself I can sometimes climax... depending on the mood. But, I will always end up having an orgasm if I watch a gif or a video of a guy doing a slight grin. I don't know what it is, but it makes me so horny. For example at the beginning of 'Dirty Little Secret', Tyson Ritter grins a little... never fails to make me cum... I'm not overly sensitive, and often I'm not even particularly attracted to the guy doing it... it just makes me orgasm... is this normal?