[经济金融] How to talk to sons

Hi I'm Gina.
( ~; R( |5 S9 d. l* D& srs238848.rs.hosteurope.deI'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. 1 k" _$ |# j) A# V$ x$ e
I have a question, maybe some of you can help me?
* z5 r7 H1 J/ b, Q% VAt 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? rs238848.rs.hosteurope.de% X& h! c. W3 B: ^
It really bothers me because i've found adult magazine in their room today.
' H+ b7 |. J5 \Should 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.
; B) ]  o8 x$ O* K* y/ C5 {. BBy the way, here is the photo of my sons:
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Happy mother of two great sons...