Embarrassed

Hey y all iv got a questions my friend is my neighbour we live in a flat iv got the top flat so as I have a husband and we don't have lot of sex coz I'm so embarrassed that she can hear the bed or something and he gets mud and argues with me for not having sex with him only the days when she's at her mums place and it's 1 or 2 a month I don't know what to do.. what would u girls do would u be embarrassed about it? Or Am I just so stupid for caring and feeling embarrassed that she's down stairs? We are really close friends but I'm still embarrassed and he doesn't really gives a fuck that she could hear us