Why Women Cry During Sex
Why women moan during sex
9 reasons why women moan during sex
Why People Scream and Moan During Sex
Women's Sex Noises and Orgasm Screams: Voluntary or Not?
That being said, just straight-up asking your partner how they're feeling is your best bet when it comes to deciphering their noises or lack thereof.
This problem can be solved by simply keeping a bottle of lube handy.