probably because they are faking it so much. they aren't exactly professional actresses. They have been instructed (but not what specifically as to what to do/say- I'll guess) to over act , be verbal/vocal . what are they suppose to say & do for the audience/camera ? They are not told to just be themselve, or perhaps they try too hard to make a good video. By & large they do a pretty good job IMO. No one is expecting that much but not be bored either.
Men look just as dumb when they are fucking, if not worse, IMO. |