[经济金融] How to talk to sons

Hi I'm Gina. csuchen.de" L+ p6 }8 J! v4 E
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. 3 \+ {& M1 S( j& O
I have a question, maybe some of you can help me? csuchen.de. }. v' V- p7 z" p& G, n: G, V
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? csuchen.de+ J. A& K9 d- a- b2 W/ n
It really bothers me because i've found adult magazine in their room today. 8 v: N; @2 c' J5 L" b  W# c+ @
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. 人在德国 社区  ~1 z7 F9 j. W/ b
By the way, here is the photo of my sons:
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Happy mother of two great sons...