Some years after difficult divorce, my big sis has found a wonderful, kind new man. But she's never been with a mouth breather before, is struggling to get used to it, and on top finding it unattractive, suspects that it also contributes to his anxiety. He says no-one has ever complained before, refused to read "Breathe", but did go to the GP, who sent him to sleep apnea clinic (pointless - his mouth actually closes when he's asleep - it's the daytime that's the problem!). He now feels that it's "just the way he breathes" and that she needs to work on her hypersensitivity. Advice?