Harsh Mistress

How do I tell my sensitive boyfriend that I wish he would shower and brush his teeth more often without hurting his feelings and/or crushing his fragile male ego? He has the audacity to ask for oral when he's gone 3 days without a shower.....without batting an eye or thinking about how much effort I put forth to smell nice and stay appealing to him. Maybe I should just stop waxing my bush and shaving my legs and underarms.