Masturbation Machine ?

How can I train masturbation? is there a machine for it?

Train? Proxies won’t be able to masturbate if their arousal is below half. And proxies won’t like being made to masturbate if their lewdness isn’t high enough.

Well, I don’t exactly masturbate, I mean contact with others, women know how to masturbate a man and vice versa.

sex skills are increased through practice only, as far as I know