[经济金融] How to talk to sons

Hi I'm Gina.
% I$ |" n& c: o8 F/ B2 \& ]I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.
, f8 ^$ z) k. II have a question, maybe some of you can help me?
7 ?: v3 b5 W6 P# T7 ?+ PAt 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?
6 p9 _: T1 W/ q" y; E) r' R% f4 T3 QIt really bothers me because i've found adult magazine in their room today.
+ ]4 L: i( A+ x; C! dShould I talk to them by miself or ask my brother to do it? rs238848.rs.hosteurope.de& W* y( x" }6 t; }
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Hope someone had the same problem and can advise me anything.
  O  H+ C* L: q* RBy the way, here is the photo of my sons:
5 o* O9 U. N  O& ?8 ^. \人在德国 社区
Happy mother of two great sons...