lady4u2, I've seen a lot of amateur porn, and, yes, I have seen some scenes where the female is clearly thinking, 'I'm more embarrassed than impressed when this cum is flying on my face in front of a camera." However, I've also seen many more scenes - especially amateur handjob videos - where the female is impressed and exhibits this in an 'amused' fashion. You know, when the female being very girl-next-door, giggles when huge jet of cum finally spurts out of their mate's cock. Or where they smile broadly and say, "Yayyyy!" Or what about the dis-believing "Oh my God!"
I can tell you when I was getting tug-jobs in my single days (usually at the end of first dates), I got the "Yayy!" several times. And the ones who were skilled enough (and it was most of them) to continue jerking me off after I started cumming, they were all the more impressed the longer they could make me cum and the more I would shoot out.