I wonder what is it that makes a burp more or less loud.
Is it the mouth aperture, how widely you open your jaw? Does it have to do with how much you push out the air? Is that why boys belch so loudly, because they have discovered the technique, how to get that air out so that it just rushes out like a great big waterfall, long and continuous?
I can hardly ever get mine that long, they’re more often a surprised little sound, a little intrusion onto my femininity.
What else is it that guys and girls do differently?