[经济金融] How to talk to sons

Hi I'm Gina.
' m* L# s& r- h+ k) `I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.
, c- ?8 ?+ g6 [4 z& x- {9 s  W1 \! oI have a question, maybe some of you can help me?
. M1 R1 C% }# E; ]# CAt 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? ; }1 P, V4 Q' a! l# ?9 V
It really bothers me because i've found adult magazine in their room today.
1 E6 K( [, U. o! p3 J2 ?, _www.csuchen.deShould I talk to them by miself or ask my brother to do it? : f2 S! \6 d/ g" _; k

/ Z( p1 O5 x4 Q& h- _- `2 W人在德国 社区Hope someone had the same problem and can advise me anything.
$ }; ^) m4 N3 c/ o# R2 M) hBy the way, here is the photo of my sons:
* e) w& Q/ A/ u; R
Happy mother of two great sons...