[经济金融] How to talk to sons

Hi I'm Gina.
) J- ?) r) v. d# ^4 iI'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. 3 o: F0 s" B. \; Y" F" u
I have a question, maybe some of you can help me? & O1 J' Q2 E* ~' H
At what age should a parent teach their son about ‘sex’ if there is no father around or would it be better for the kid to have a male family member to do this? ! U2 m/ D6 {5 e  b1 j, J! F" e
It really bothers me because i've found adult magazine in their room today. rs238848.rs.hosteurope.de) A" k: H* g0 q6 t$ Z# e" y
Should I talk to them by miself or ask my brother to do it?
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& G& G5 ~. h2 |+ N4 gHope someone had the same problem and can advise me anything. rs238848.rs.hosteurope.de3 S$ Z' Z2 }& G! V5 e) D
By the way, here is the photo of my sons:
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Happy mother of two great sons...