Male body language & marking territory?

"He puts his hand on the back of your chair or his foot on the bottom of your barstool. If he touches something that belongs to you, it’s a subtle sign that he is marking his territory."

Guys, true or false? Do you 'mark your territory' in any way, or do something to show that she's 'yours', whether you guys are dating or not?
Male body language & marking territory?
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