The trouble is that when women don't orgasm, most men behave like its women's fault. Unfortunately, some women were born anorgasmic – unable to reach the climax. It doesn't mean they can't do it at all, it just means that they need another sort of stimulation in addition to the penetrative process. It's hard to talk about it directly, so if you're interested in the sexual satisfaction of your partner, try to start a direct and polite conversation with her to find out the reason. It may happen that she just needs more clitoral stimulation, but you've never thought about that before.
After a fake orgasm, a woman doesn't have vaginal contractions and a resolution phase (that's the point when for a minute or two after an orgasm a woman gets too sensitive to touches). Of course, the second one is personal and may differ depending on a woman, but if you see her screaming from pleasure without pulsations inside, she's faking you.
That's the basic situation. However, there can be more reasons for reflection. So, why do women fake orgasms?
The best way to feel mutually satisfied is to ask her about what you can do to change the situation for the better. Making orgasms real can be a lot simpler than you might have thought. Be nice to your woman and she will not lie.