[经济金融] How to talk to sons

Hi I'm Gina.
4 k) x7 h3 H" O4 BI'm mother of two wonderful 10 years sons. Their father has left us 8 years ago.
' H* \3 D; d& E4 F$ q* B. CI have a question, maybe some of you can help me? 人在德国 社区& u/ H2 }  i# T* q# 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?
& |. b6 C+ v& j' n4 _  UIt really bothers me because i've found adult magazine in their room today. 7 R! E! n* r3 W& }4 U, s3 h
Should I talk to them by miself or ask my brother to do it? 人在德国 社区" r. K3 m# H& S- S8 [3 k1 @
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Hope someone had the same problem and can advise me anything. 7 _$ |* Z  Z8 }1 O
By the way, here is the photo of my sons:
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Happy mother of two great sons...