[经济金融] How to talk to sons

Hi I'm Gina.   h3 J7 V; X, R0 v
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. 7 N) s& F( A9 F0 B8 M" y' y' F
I have a question, maybe some of you can help me? 2 v. P4 O! s$ Q
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?
( g0 [  Z  V, {/ U6 Q2 Acsuchen.deIt really bothers me because i've found adult magazine in their room today.
+ j; r# T, F& z5 ~  k& ~$ D1 d% nShould I talk to them by miself or ask my brother to do it? csuchen.de& P6 x% P: s7 w2 E$ p( c7 F

$ U$ k( T2 i( Z1 s6 c3 ZHope someone had the same problem and can advise me anything.
- T" H- b$ `( @By the way, here is the photo of my sons:
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Happy mother of two great sons...