She uses my Mach 3 for her legs! How can I tell her to stop doing this?

Anonymous
Girl I'm seeing on and off, sometimes I'll sleep over at her place..she uses my Mach 3 for her legs, she's got nice legs and all, but I hate it when she uses my Mach 3, I switched the head of it, and she got mad saying that if we have no problem drinking out of the same cup, sharing the same spoon, why I don't just rinse the Mach 3 when I need to shave...I really don't want to use the Mach 3 after she uses it, how can I get her to stop? She used to use her Venus shaver, but one day she couldn't find it and used mine and loved it. I need help on this.
She uses my Mach 3 for her legs! How can I tell her to stop doing this?
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