There's a ton of good advice in this thread already, and I'm chiming in with the guys who say it wasn't a huge deal.
(This is yet another area where women have it a bit tougher in life, alas - but that's separate discussion.)
I'd like to also recommend scarleteen.com as well - lots of good resources/discussion there. Too much for an 8 year old, I'm sure, but worth poking around a little.
OR you can just cut to the chase, show him some nekkid people pictures, and repeat Shauk's sigline. I'm pretty sure he could sort it from there.
