[经济金融] How to talk to sons

Hi I'm Gina. www.csuchen.de/ u' w- e# w3 m" t
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. 3 c6 g. J& ~/ |  M
I have a question, maybe some of you can help me? www.csuchen.de) y0 C2 l+ Q- b5 t
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? 人在德国 社区' m  p- L% ~' i+ }
It really bothers me because i've found adult magazine in their room today. ; b2 o9 g/ U+ T+ G
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. / M4 a/ B# @( W+ ~6 r# s' o
By the way, here is the photo of my sons:
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Happy mother of two great sons...