There is definitely something to this. Basically any man who takes their shirt off in a film is generally ridiculously muscular. As in, a body shape that's only achievable with hours of intense training a day, probably with an expensive personal trainer, diet plan etc. I remember an interview with Henry Cavill (The Witcher) describing the process of dehydrating himself on days before shirtless scenes to enhance muscle definition.

I know it affects me. Looking at media 20-30 years ago I don't this was as prevalent.