[经济金融] How to talk to sons

Hi I'm Gina. - C6 s" ~1 j9 c6 V' T; K
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. 人在德国 社区( d( e) R( j/ E7 s, e
I have a question, maybe some of you can help me?
9 ^4 R, W% b0 EAt 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?
+ N7 n% Q; R4 A人在德国 社区It really bothers me because i've found adult magazine in their room today. , g4 D- H4 }  `  P" ~5 u
Should I talk to them by miself or ask my brother to do it? % E! j6 `0 l  @' C$ a* t
) V* j& L; P. w& ~, h6 b
Hope someone had the same problem and can advise me anything. ! K  |; u) }* Q5 N. e
By the way, here is the photo of my sons:
# [+ p1 m" I8 c2 k
Happy mother of two great sons...