The room smelled like ASS?

So I was having sex with this guy I am dating and we were both naked after the fucking I realised that the room smelled like ASS.
It was a little disgusting and a turn off, I have no idea if it was coming from me of from him what do I do to prevent this from happening if it's me and what do I do if it's him?
Also I realised his room stank before we were fucking how do I tell him about this?
The room smelled like ASS?
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