Is it normal to moan during sex?

alot of woman actually cant make any noise when under intense orgasm, their body spasms up and they just shake/twitch uncontrollably, making the faintest of noises. If shes making loads and loads of noise she's usually just exagurating, can be that its fun to do orrr she just wants to spur herself on orr make you feel better ;) sometimes the quieter they are the more intense it is for them