interesting question and i can definitely see it's getting a bit personal, esp. for an adolescent.
On a related note, our running club shares info on Garmin site about their runs and we can view each others downloaded stats. I always feel a bit odd looking at the heart rate data of the women, being a guy, like it's getting a bit personal on the physicality side. LOL. I know it's ridiculous but it's there just the same.