[经济金融] How to talk to sons

Hi I'm Gina. 4 v+ k; b# @6 K. n
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.
0 k1 _  o- P) L, EI have a question, maybe some of you can help me? + e9 ], p7 u% n5 R9 \% D5 E
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?
3 Q* w4 V  p$ @; B% p, ^9 MIt really bothers me because i've found adult magazine in their room today.   p8 Q" q: ]% p4 D4 y
Should I talk to them by miself or ask my brother to do it?
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) F; o3 Q5 ^! {9 g3 k7 k' S% uHope someone had the same problem and can advise me anything. csuchen.de& _. y2 C! K( J5 d6 O) w9 H0 M
By the way, here is the photo of my sons:
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Happy mother of two great sons...