Why did my girlfriend ask me to choke her during sex?

At first we were like kissing in stuff and i was getting ready to put it in and when i did she was like please choke me. Me being me i didint want to because i didn't want to hurt her or anything but it was getting to the point where she was irritated that i wasn't choking her. Why did she want me to do this?
Why did my girlfriend ask me to choke her during sex?
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