Healthier...maybe, but I also wonder if it's the hormones and chemicals we ingest every day. The hormones they give to cows and chickens to make them reproduce earlier and more frequently...makes me nervous!
Also, I think there is a difference between "experimenting" (playing doctor anyone?) and actually having sex! I think kids need to be educated about the concept of sex very early...they should be taught the proper names for all their body parts, to reduce the possibility of sexual abuse, but also to take away a sense of shame about their bodies. It's a touchy subject to deal with.
But just because their bodies are maturing faster and earlier, doesn't necessarily mean their minds are. Developmentally speaking, children are usually able to undestand and accept certain concepts or responsibilities at certain ages. Just because a 10 year old can physically have a child, doesn't mean they are mentally or emotionally prepared for it.