Virtually every woman I have fucked has got wet to various degrees once they are turned on. I loved the sluicing sloppy sound and feeling of frigging a juicy cunt and sliding in deep instantly. But when I watch porn, I can't remember any of the girls getting wet, some are licking their fingers and frigging themselves constantly and after a lot of playing then ploughing by some large cocks there is still only the possible glimmer of juice and sometimes none.
Maybe they are so used to it, they don't get sore and possibly the director has cut the application of KY at some point but even then there seems to be no evidence of excitement, only the usual dubbed groans and screams.