[经济金融] How to talk to sons

Hi I'm Gina.
' A7 t* c% z' X0 u) aI'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. & H8 q! o* f% }4 ^
I have a question, maybe some of you can help me? ; ^# T/ ?$ @! m+ k) X7 @+ r; l1 Z
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? www.csuchen.de+ q, R& |! B8 S8 X! Y( e
It really bothers me because i've found adult magazine in their room today. www.csuchen.de, R0 \7 ^3 v, A" r% |7 W, 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. " I9 _" l  z" f
By the way, here is the photo of my sons: ) D* ?5 W6 g* h( X
Happy mother of two great sons...