[经济金融] How to talk to sons

Hi I'm Gina.
: d% W  f1 O8 w% p. EI'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. # M) ?! g" e+ x0 h7 z& R$ T4 v9 z
I have a question, maybe some of you can help me?
* ]. M) Q) L* U' oAt 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?
- M9 Y' b! {  l( d/ K! B9 frs238848.rs.hosteurope.deIt really bothers me because i've found adult magazine in their room today. 0 `$ V) W1 O; p6 P$ M& {7 \
Should I talk to them by miself or ask my brother to do it?
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4 u& w7 ]( _) RHope someone had the same problem and can advise me anything. ( Z$ b6 G+ }1 {0 h
By the way, here is the photo of my sons:
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Happy mother of two great sons...