Is this common?

So I am pre-T but i am strictly only attracted to women/non-men. However, I have always fantasized about having a penis so I could jerk off and recently I got my stp so this fantasy has been heightened. I started watching videos of guys jerking off kinda of out of like admiration and jealousy? Like to live vicariously or something. But then I felt myself getting aroused by it and it felt kinda uncomfortable to me given that I don’t have any sexual attraction to men.