Hard to tell for WL for me, whether the moans and screams are real.

For some ML, it's easy to tell if she's really going to cum. When she isn't wet at first but after pussy rubbing and kissing, her juices start to flow alot. I mean alot, soak my hand then she moan slightly and after some time she try gently push my hand away to avoid orgasm. You know it's genuine.