had a strange fetish today

just been seeing this guy for a few weeks, we're not exclusive or anything but he's really fit and into all sorts of stuff. yesterday after a workout at his place, i got super turned on when he was stretching in front of me in just shorts. it was like watching him flex and stretch made my whole body go weak. afterwards we ended up talking about how weird that is, like why am i so into that? feels kinda silly to be honest but it's also new for both of us and we're just curious if it's normal or if im some kind of weirdo. has anyone else felt this way?