Mother Son Puberty Talk

My teenage daughter is asking me if I've had "the talk" with my 11-year-old son yet.  My son would run screaming from me if I tried!  I keep books around that are age-appropriate for any of the kids who don't want to ask me straight up, however, I do think dad needs to sit down and have a chat with him.  It's about time to bring it up again.  I mean, I can talk about chest acne or facial hair but when it comes to all that other stuff, I think dad is a much better person for the job. I'm sure my son would appreciate that as well.  Of course, I'd answer any questions he has but he won't ask them (of me anyway).  Like I said, he'd run screaming.