I think pretty much any women's magazine is going to tell you that the number one worst thing you can do in bed is fake orgasms. That is not true. The number one worst thing you can do in bed is "whatever Patrick Bateman did." It is closely followed by "eating crackers." Faking orgasms is around "number 72" insofar as it is a thing that you are perfectly entitled to do if you want. Here are some perfectly reasonable reasons you might want to.