Should I tell him?

So there’s this guy I’m “talking” to. We’ve been to the movies a lot, kissed, cuddled, nothing more than that. I’ve noticed this smell, it basically smells like ass. I thought it was me at first, but it’s only like that when he is around. I’m just assuming it’s bc maybe he doesn’t wash himself down there? I’m not sure. I need you buds to help me and let me know if I should talk to him about it or not. It’s nauseating!!! Thank you!