My Girlfriend Is Loud in Bed?

My girlfriend and I live together.Well,My brother flew into town for a business related meeting,and he will have to stay with us for a while,not too long,but it's for the company he works at and he represent them and whatever.We live in a very nice house,and the walls are supposed to be soundproof,and his room isn't really close to ours.But last night was his first night of staying.Well,last night my girl and I had sex,and she doesn't scream or shout,but she moans A LOT.This morning he mentioned that,uh,he heard what we were doing,it was kinda embarrassing,but awkward too.Advice?
My Girlfriend Is Loud in Bed?
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