for me it's essential and not always a scripted dialogue. For solo girl I love it when the girl looks off the screen at me and shares her enjoyment or deliberately teases and flirts with me. For couples, yes I want them to communicate with each other and for Gonzo with the camera as well.
Hot action from performers requires them to put a lot of themselves and personality into a scene. It has to sizzle and talking helps sometimes. Yes there's a problem with foreign girls talking in English and they can speak the native tongue. To get it right, don't use foreign models. Or models who are plastic and churn out a scene on auto pilot.
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