well i think as women mature they get to know what they want, and how to get it....and when they need to take it. when women are either uncomfortable with the situation sex has created she'll sometimes fake an orgasm to get it over with. most often it's because she realizes that her partner is not going to give her an orgasm and shes not comfortable enough to got for it....i was guilty of this knid of "fake orgasm" many times through middle school but now that i have a steady boyfrined and have grown up quite a bit i wouldn't dream of it.. i agree for a mature woman who knows what she wants a fake orgasm is silly and pointless!
but we wouldnt ever want to do it if there werent so many "useless" men in the bedroom. it's not all about you, and yes, it's supposed to last longer than 10 minutes