Anal sex please need advice

So me and my so have been together only for 10 months and we just started having anal so and it was ok until this past two times after we're done it's smells like shit please don't laugh so he doesn't say anything nether do I but what should I do I don't want this to happen again it's soooo embarrassing and I don't fell like doing it again please help what can I do 😞😕🙁