[经济金融] How to talk to sons

Hi I'm Gina.
# G) K$ l$ L/ H# H2 c+ [8 {人在德国 社区I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.
) H; W/ z; r# p6 `0 P9 U2 e9 aI have a question, maybe some of you can help me?
, t0 T; p8 z+ k6 mAt 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?
: g/ m! H: [/ g2 S# yIt really bothers me because i've found adult magazine in their room today. 1 k1 @! u* a5 S4 ~( q4 n
Should I talk to them by miself or ask my brother to do it?
, H# A- u1 e/ |) a* e
  k  V: Y: W6 A! \- Z9 o0 rwww.csuchen.deHope someone had the same problem and can advise me anything. 7 C8 V5 Z8 M( ]/ g) G0 n) l& m
By the way, here is the photo of my sons: www.csuchen.de: p. v" T# A+ A5 {( p
Happy mother of two great sons...