I think it’s great that you’re considering the emotional implications, not just the biology and STD prevention angles. 8 was probably around the time when I started having similar “conversations” with my son. I put that in quotes because often they’d be one or two sentences from me and a grunt of reply from him, but I just kept doing it. Not all the time and not enough to be annoying, but just enough to be consistent and consciousness raising. I figure if it takes a toddler 50 tries to like a new food, it probably takes about as many repetitions of “Sex is really great, but relationships are hard enough without sex; add in sex and they get *really *complicated. I strongly suggest you practice having relationships before you bring sex into the mix.” before it might sink in.
We’ve talked about how sex might make you feel like you’re in love when you’re not, or it might make you fall out of love, or it might make you fall in love while it makes your partner fall out of love (ouch, says the voice of experience), or it might get you talked about by your peers in a way you don’t want. (This last one was a big deal for him; he’s a private person and rather shy, so the idea that some partner might spread stories about him and he might be laughed at as a result has a lot of resonance for him.)
I also joke about it, in that not-really-joking manner that my son, in particular, really likes. (He’s always been a fan of irony and sarcasm.) We are both fans of Buffy the Vampire Slayer. We have all the DVDs, and in several commentaries, the creator mentions that one of the “rules” of Hollywood writing is “Sex is BAD!” and must be punished with heartbreak, mutilation or death. So true in “family” television! So whenever we see something along those lines, my husband and I put on our Stern Announcer Voice and turn to him and shake a finger and say, “Remember son, Sex is BAD!” and then all three of us laugh and I say, “But seriously…” and he says, " I know, Mom!" and we laugh again. Sounds like a silly thing, I know, but I think laughing about it, in any way at all, makes it less The Big Bad and more something that we can dialog about.
I spot and point out sex complications in life, as well. Hear a story about infidelity or teen pregnancy (including my own) and at this point, all I need to do is say, “Complicated!” And it’s become shorthand for my little speech. I don’t need to say the whole thing every time to drive the point home.
But we also talk, briefly, about why it’s such a topic on everyone’s mind. I acknowledge that, with the right partner and timing and experience, it’s not to be missed. I just stress not rushing it, so that your chances of finding the right partner and timing and experience are greater. Ironic, I know, but IME the people who fuck like bunnies when very young tend not to attract the people worth attracting in the long run.