Um. I guess we all can make ugly faces in bed. Ugly faces are just ugly faces. You know, when you are on your 8th group photo and the person holding the camera is like “alright, everyone make ‘ugly, silly faces’. Say cheese!”. Now just imagine making that face, at the very moment you climax.
In fact, better yet. I fucking dare you to do it next time you have sex. Right as you cum, do your cross-eyed, tongue-sticking-out weirdo silly ugly camera face. Don’t tell the person you are with that it is coming.
10x as many points if it’s the first time you are having sex with the person.
Then report back.
Other than that though – no. I do not think a woman naturally can look ugly in bed by cumming. I think it’s hot as fuck. ALWAYS.