Do women really fake it all the time? how do i tell?

Some do..: Some women fake orgasm. Some reasons include : obligation, expectation and some even out of habit. The issue is usually rooted in communication break down. Communication is key, so there isnt pressure to perform from either partner and also to help direct efforts. You shouldn't focus on trying to tell if she is having one - you should focus on the task at hand and enjoy the experience.