Just like in straight movies where the guys never play with the woman's all important clit when they fuck their gals, gay movies never address the eroticism of male pornstar's nipples. Is it because so many pornstars in gay films are straight and not aware of the eroticism of a man's nipples. In my 30 years of erotic massage very few straight guys have sensitive nipples, whereas most gay men do. I find this ignoring particularly noticeable in porn scenes where guys have pierced nipples, which usually makes the nipples more sensitive and makes the area so much more sexy.