advice ?

does anyone else have this same problem. i live with my mum and my brother who is 15. i am in lockdown with my boyfriend here and my room is right next to my brothers who is literally toxic and i do not want anything to do with and he always says that he can hear us having sex although i highly doubt that because i am always cautious that we are so quiet. anyone got any tips or advice on how to actually have a decent sex life while having a life ruining brother next to my room?