I don't want you to do things where you put your hand on the back of my head.
I saw this use of where and wondering is it right use or "when" should use in stead of where.
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It depends on what the speaker means by this sentence.
(When, where) While you have your hand on the back of my head, I don't want you to do things. ("When" is probably better.)
(Where, when) At the point in time where your hand gets on the back of my head, I don't want you to be doing things. (One seems as good as the other, but someone might insist on "when".)
(Where) I don't want you to do things at the place where you put your hand at the back of my head. (It might be the top, the bottom, the sides. "When" is not proper in this context.)