Nonononononono!
So I'm LDS. My subject line basicly says the final answer.
Here's why:
16-year-olds are not adults, physically or mentally. Some would debate this issue (of adulthood, not sexuality), but these are mostly individuals who have not studied human development in depth. The nervous system doesn't develop fully in most humans until late teens to early twenties. Sure, it's mostly functional, but (surprise!) the brain has
not fully developed; reasoning on an adult level, therefore, is beyond most of us during our teen years. You learn this in basic university-level human development classes.
One of the great powers given to people is the power to procreate. It is attached to this wonderful experience of sex. I love sex! It feels great! I am a member of a church that encourages sex -- after marriage. Because of the emotions involved, and the sacred power, like God's, to give life, this is something that should be reserved for married couples. Children deserve to come into happy families with a father and mother.
I hope that my children will wait until they have found that person with whom they desire to spend eternity, and after making promises and being legally married, have a wonderful sex life. I, like the mother who started this thread, intend to speak openly with my children about sex. My daughter is only three months old, so she's a bit young for these discussions. When she can begin to understand, I will teach her that sex is a wonderful experience that can enrich her life, or if partaken of in the wrong circumstances, can be destructive.
When my children are adults, I will not force my values on them. No good can come of forcing values on anybody. When they are youth, I will not support premarital sex; I will encourage my children to wait. If they don't follow those values, Sea_Gal, our child, and I will need to discuss how work through that issue, respectfully, together.
Truthfully, I didn't always have to this standard. I wish I had. Sex is so much better after being married. Premarital experiences made our first experiences together strained. How sad!

Husband to Sea Gal, father to 1 dd, born at home waterbirth!

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