[经济金融] How to talk to sons

Hi I'm Gina.
- {) `7 W! P, H" LI'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.
( q" O! B7 E( w$ d# Z% L5 xI have a question, maybe some of you can help me?
, Y8 a% ]* H; F5 c! a% |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" C. N* `7 L! k3 ^; b; ~4 e2 ]
It really bothers me because i've found adult magazine in their room today.
0 r3 e  j( d6 }3 A! c1 f( Z' DShould I talk to them by miself or ask my brother to do it?
1 D2 \) U3 X6 K- c- G6 `www.csuchen.de " b3 N: v7 w: v7 p
Hope someone had the same problem and can advise me anything.
* R& F6 D# ~# _" V4 H; EBy the way, here is the photo of my sons:
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Happy mother of two great sons...