Yes, puberty (12) is and has been completely acceptable throughout all of mankind's existence (except for now in parts of the world). Although, I also believe criminalizing anyone younger than 12 for consenting is also wrong. The push to keep raising the age is fairly recent for our species... and driven primarily by religious dogma. Their real goal is no sex outside of marriage.

Yes, disease and pregnancy are very real concerns. Non biased education and free access to healthcare (including condoms) are the answer. No need to resort to name calling, just think critically and rationally about it. Our beliefs are based largely on our social norms, which are dependent on where/when we are raised.

I know sexuality at a young age is innate and normal, not because of our current society... But because I had sexual desire at a very young age, before anyone ever mentioned sex to me (I didn't even know why I got an erection looking at my dad's Playboy magazines. I only knew, I was attracted to girls, wanted to see them naked and touch). I also played doctor when I was young with a girl my age, it was her idea (not that I didn't want to, I did). If you are honest with yourselves, didn't many of you have sexual desires young too? Why? Those desires weren't taught. Why? Because they are innate and normal. For this reason concensual sex should never be criminalized (and don't tell me 12 can't consent, I was fully aware by 12)