Advice Needed: 12yr old son & hormones

Good evening,

I am a single mum of a 12 yr old boy.

My son Is autistic. i think he is at the stage in his life where he is becoming 

curious about his body & girls and I am at a bit of a loss. I need to have a talk with 

him but I don't know how to approach this. Does anyone know of any resources or

habe you got any advice to could offer please.

Thank you

Rox