[经济金融] How to talk to sons

Hi I'm Gina. - T9 t( K3 w- g  `) I, W  z
I'm mother of two wonderful 10 years sons. Their father has left us 8 years ago. 5.35.249.64' Z0 y% n4 g" O" g1 E( J' L+ v
I have a question, maybe some of you can help me?
% K: b, b: i$ ~9 V5 `  i1 YAt 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?
- U! \) H3 p7 w6 q" J. zIt really bothers me because i've found adult magazine in their room today. ) Y/ {' j  d3 _. H6 v
Should I talk to them by miself or ask my brother to do it?
- T( u( a: q: q3 `5.35.249.64 + d! O8 I, ?* L2 U7 a
Hope someone had the same problem and can advise me anything. - V4 }8 |- d& A6 E
By the way, here is the photo of my sons:
& y, T. g# E$ ?( y9 m
Happy mother of two great sons...