Hi K.,
I suggest that you take a look in the mirror and you will see the best sex ed tool of them all!
Your child will learn best from you!
Sex isn't a mystery. Everyone does it. You don't have to be especially intelligent or athletic or skilled.
Sex gets to be squirrelly when you think about it and the social context in which it occurs. That's the significant part.
You want your daughter to have wonderful sex, but you don't want her to get hurt, mostly emotionally, and to a second degree, physically.
It's not so much the horror of chlamydia, rather it's the real awfulness of a lousy relationship, of sex for sex's sake rather than meaningful sex within a solid friendship and loveship.
Get the book (from your library) How to Talk So Teens Will Listen and Listen So Teens Will Talk.
Read it, and USE IT.
All good conversations begin with putting your feelings aside for a moment and validating the concerns and feelings of the "other" person. When you are doing this, the "other" is much more amenable to listening to you.
You can't control your daughter, but you can influence her.
If you are an accepting, pleasant to be around, encouraging, reasonable person, the chances are high that your kids will listen to you.
If you're seen as demanding, autocratic, punitive, and irrational, your chances of being heard are pretty low.
And, if you are living a life that is contrary to how you want your kids to live, they'll see through that as well.
R. Katz, Psy.D.