[经济金融] How to talk to sons

Hi I'm Gina. 人在德国 社区1 d% M9 c1 r, y2 x3 W7 \) r! R4 \8 l
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. rs238848.rs.hosteurope.de# r2 Y1 _4 _/ y0 u' s
I have a question, maybe some of you can help me?
2 q7 {. a3 M' P" ]2 _9 QAt 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? ) v( f* T" G# l
It really bothers me because i've found adult magazine in their room today. 人在德国 社区/ K  L7 p/ ~& s- v" B
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. ( ]4 V  |1 B( P2 W0 Q! `4 I( ]9 o
By the way, here is the photo of my sons:
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Happy mother of two great sons...