The same way you tell her, with one major difference: Your body language.
Women are “face-to-face” communicators, while men respond better in “side-by-side” talks. Women like a lot more eye contact and anthropologists think it has a lot to do with the biological roots of nursing, cuddling and caring for infants, which requires prolonged eye contact.
Men, on the other hand, tend to see eye contact as confrontational. Helen Fisher, in what has to be one of the best sex books ever, Why We Love, explains it this way:
“For many millennia men faced their enemies; they sat or walked sat by side as they hunted game with their friends.”
In other words, if you’re going to talk, do it while you’re walking, cooking or doing some activity where you’ll be side-by-side, not face-to-face.