I feel like any age a child starts masturbating is an appropriate time to buy them a sex toy. I'd rather they use a bullet vibrator instead of an electric toothbrush or marker. And when they get older, no more using socks, lotion, or hairbrushes; use get them dildos and fleshlights instead (or let them pick a toy they would like).

How would you approach this situation? 

 @e9334eeb if I had kids who wanted sex toys I'd help them pick some one and I'd make sure they stay safe, keep them clean, use them correctly, etc