[经济金融] How to talk to sons

Hi I'm Gina. , F8 y9 M9 @. u% p
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. 9 `+ p  S% d+ n$ `. w
I have a question, maybe some of you can help me? * A& ?2 V4 s5 H7 v0 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? 7 Z2 T$ A& }# t( d9 O
It really bothers me because i've found adult magazine in their room today. 人在德国 社区) S! m4 X: Y+ F' C1 j
Should I talk to them by miself or ask my brother to do it? - N  T: i* ]4 Q: R( X' r
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Hope someone had the same problem and can advise me anything.
8 b1 G" k# ?& G4 X) c- G2 ^: |By the way, here is the photo of my sons:
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Happy mother of two great sons...