I think I'd rather have my precious male ego (and what a big ego it is!) bruised by the truth of being told that you're faking it. Honesty is the best policy, etc, and is the first step towards rectifying any problems in the stud's technique. Better to be an improved sex partner than to be merely a legend in my own mind. But then again, I'm contractually obligated to a life of celibacy these days - the word "orgasm" crosses my mind as often as the Mongolian word for "Cheese Danish". Nothing to see here. Move along.