pls recommend a book to help 9yo AS ds with relationships and appropriate behaviour

[milknosugar]

bit worried about his attitude towards girls and comments he has made recently about sex. i have a great book to explain the mechanics of the birds and bees but the relationship bit is a total puzzle to him. need to explain stuff like relationships within families (whats ok and not!) and outside families. there are loads on amazon so if you have read a good one i would be grateful for recommendations or books to avoid. i posted in relationships aswell but thought some people here might have more ideas. tia

Let's Talk About Sex by Robie H Harris. I've been reading it with my 9 year old ds and he's loved it. Covers all matters relating to sex, relationships, families and appropriateness in a very relaxed and gentle way. Can't recommend it enough.

thanks kt, will have a look for it