Yes most of them are faking it.Sometimes it can be so obvious that they are overexxaggerating and extreme moaning doesn't really feel convincing but they are encouraged to do it anyway since it gives the shallow impression that they are really into sex.I prefer eye contact or a passionate facial impression to see whether the girls are really into it and combined with romantic elements such as kissing or touching it can create a more powerful image that they love what they are doing and simply screaming into the camera is just too cheap for me.Lesbian porn can do these things pretty well.

[Link]