I'm not sure what to think of sex dolls. On the one hand I wouldn't consider them any different than a more mainstream sex toy women might possess such as a vibrator. But on the other hand if the doll is designed to replicate a child's body I'd find that to go against a norm I'd rather not see broached. I guess I'd rather not see government try to regulate it but wouldn't mind a little social shaming.
On reflection I think I'd say that any sex play with products representing consenting adult activities is fine but any that promote non-consensual activity shouldn't be taken lightly.