From what I remember, the first somewhat graphic chastity lesson I had was in college. Every year at BYU our Bishop gave a Relief Society lesson. We all felt bad for him; we knew it was uncomfortable for him. And it was uncomfortable for us.
Yesterday in Seminary, Mr. X had to give "the talk" to four young women.
For the first time perhaps ever Mr. X followed the lesson manual exactly, reading Alma 38 & 39 straight from the Book of Mormon and then reading a portion of a talk from Elder Scott called the Power of Righteousness.
Teen pregnancy was briefly mentioned. As was adoption and repentance.
It went pretty well, although, one of the girls blurted out, "uhh, this is really awkward!"
Honestly, it wasn't that big of a deal. But if you've got any tips for teaching this lesson to adopted teenagers I'm all ears.