my o my. sensitive area but love conquers all. she needs to be told in a lovely way but first u can surprise her with things that can help by u d man doing ur research on d side. so u will fins like " hun i checked something that will make u n i smell like sooo coool, wot do u think hun" n if she is completely unaware of the situation she will be like wow thats soo cool, thanks hun but then if she is somwhat aware or some one else in the past relationship has told her of the same body odour then she will keep calm and know what u are trying to do but then she will respect u allot for being polite about it. she will therefore not only appreciate ur effort but she herself will atleast make attempts abt d situation. love is the key n im sure there r very good qualities about her so why dissolve it cos of body odour which can be rectified