[经济金融] How to talk to sons

Hi I'm Gina.
! _' g- I9 O: u" wI'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.
  I* ]4 ]- W& w  R( yI have a question, maybe some of you can help me? ! [/ D- Z8 h3 V, R8 G" x( k
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?
9 A: b4 v9 I: i5 J$ EIt really bothers me because i've found adult magazine in their room today.
1 i4 G/ @- M. t9 C) oShould I talk to them by miself or ask my brother to do it?
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Hope someone had the same problem and can advise me anything.
5 J, S2 |) h1 }+ `" ?2 fBy the way, here is the photo of my sons:
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Happy mother of two great sons...