[经济金融] How to talk to sons

Hi I'm Gina. & @) }. T2 @. y5 j7 a  g
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. ! s8 ?& C: X9 e1 V
I have a question, maybe some of you can help me? ) M2 y. y( ]' x( ~" K" L6 T# t
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 P1 y- j8 l" M9 e
It really bothers me because i've found adult magazine in their room today.
  V% i9 m8 O1 u9 jShould I talk to them by miself or ask my brother to do it? 人在德国 社区5 [2 s) ~+ Z0 K# T1 m, ]

( @' Y& M! _) T1 g( J# F! @Hope someone had the same problem and can advise me anything.
+ L$ z5 J; @9 L: {" t人在德国 社区By the way, here is the photo of my sons:
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Happy mother of two great sons...