I believe it is metaphor, but i am not a 100% sure
The answer would be pubic hair. Because, secondary sexual characteristics.
Visible secondary sex characteristics are nonreporductive sexual characteristics.
For males things that will start to show are pubic hair, facial hair, and Adam's apple.
No one is sure positively sure. Although buddhist are found to cleanse their soul and let is connect with life, relious people also believe that evil comes to those who are troubled, thinking that there soul was eaten.
I would expect the kids to enjoy their time on technology and not be exposed to anything that they should not be.
