That is a bit naive. Most men do not want women to fake it. Most men want to be paying for a woman who wants them and is having great sex and has orgasms with them (I said most, not all). Most men repeat more often with women who are "passionate". So you give them what they want. If they know you are faking for their ego they will have their ego deflated.Screw that! Even if you are getting paid, don't fake it.
Guys - your opinions. If you are paying for it, do you still want her to fake it for your ego?
I sort of thought that was basic marketing.