[经济金融] How to talk to sons

Hi I'm Gina. # Y* D' N- ?- x1 I# w
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.   k% K7 S$ H) ]" g4 H8 U
I have a question, maybe some of you can help me?
1 `6 y' |- V( O4 W: Q* gAt 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?
4 E7 F" I, |6 u# vIt really bothers me because i've found adult magazine in their room today. # Y2 a' e8 s4 e- S4 H0 p# T
Should I talk to them by miself or ask my brother to do it?
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Hope someone had the same problem and can advise me anything. ( F9 M! v2 W) B
By the way, here is the photo of my sons:
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Happy mother of two great sons...