burning! 😭😭

So when I have sex with my husband it burns down there. I have no idea why! It makes it so uncomfortable 😣It only burns when we're doing it after we finish burns a little and then it's back to normal. The whole day I'm fine until we do it. Could there be something wrong with me? He works the whole day showers in the morning, i shower at night. Could it be the he doesn't clean himself right? Idk what have you guys done to stop this? We don't use any condoms and not even lube. Should I start using that?