It's probably a decent indicator. As I understand it, there's a lot of genetics involved with body hair that is or isn't triggered based on secondary hormones that are triggered by the primary hormone of testosterone. I believe finasteride, a drug to fight baldness, tends to also block some of those secondary hormones that are associated with triggering body hair genes. Not suggesting it for that and I don't know that you could get a prescription based on that. It just comes to mind because it seems to validate the notion that secondary hormones affect that. On the other hand, if your male relatives are also balding, you could probably get a prescription for it for that. I'm not sure how well-documented the body hair aspect of it is though. It may be speculative at this point.