I don't even want to TRY to explain this...
YouTube - Sex Trek
Holy crap that is hilarious!!

I second the amateur stuff being hotter for sure.

As a female there's something amazing watching it because you know exactly how fantastic it feels for that woman.
As far as that goes, its not fair! My and other men's best orgasms pale in comparison to the lowliest of females'. Maybe thats why men want to do it so much...