Gently, as this is a sensitive subject and not many can take it well. Nevertheless, you need to be direct. Start off by having the conversation in a neutral moment, like while driving to the mall or walking in the park. In these situations, you are both distracted by your surroundings and it won’t seem like you’re cornering him. The last thing you’ll want is for him to feel insulted and get defensive.

Let him know that you detect an unpleasant odour from him and are concerned. Assure him that this in no way affects the way you feel about him but you don’t want it to interfere with your romantic life. To make him more comfortable, you could also open up the discussion and ask if there is anything about you that bothers him.

If you’re sexually involved, you can also try a light-hearted way of telling him. While showering together, you can playfully wash him everywhere and tell him that he smells so good now because you’ve soaped him up properly. Hopefully he will take it well and work on it!