Another true story: About 4 years ago I was on the treadmill and my son, who was 11 or 12, was playing a video game on the couch. Suddenly he asks "Mom. What's a blowjob?" I stopped dead, shocked, shot off the end of the treadmill and hit the wall behind me. Awkward moment alert.
Anyways, I explained. Just like a few days later I explained orgasm. I'd rather he ask me, no matter how uncomfortable I am. Because I'm sure he's just as uncomfortable.