[经济金融] How to talk to sons

Hi I'm Gina. 人在德国 社区' |( P- Q' G/ i2 }6 N1 G% c# e
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.
0 G& C9 _$ [7 o0 R2 R1 nI have a question, maybe some of you can help me? 人在德国 社区  V8 r( `: t2 S( n" x& o
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?
3 d6 ^' D/ _1 _: z! wcsuchen.deIt really bothers me because i've found adult magazine in their room today.
& b- n0 Q" \8 \: r; _. K  G$ Y" u# _Should I talk to them by miself or ask my brother to do it? / ?6 z  L* g2 s& p- P1 T

! U2 `; W, c* F1 @* d; k" m人在德国 社区Hope someone had the same problem and can advise me anything. 人在德国 社区5 N+ F. G- Q0 p/ ], s
By the way, here is the photo of my sons:
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Happy mother of two great sons...