Girls moan from better technique more so than from getting bigger.

I can make my wife moan with a finger if we are somewhere with privacy but after log slamming her into submission, she sometimes doesn't moan a bit when we are home with for kids in the house.

Mood, privacy, technique and many other factors will co tribute to moaning.

Some girls do and some girls don't. If she has a toe curling eye rolling orgasm, moaning doesn't matter