My girlfriend wants me to do this.. I'm not sure/options?

My girlfriend and I have been dating for about 4 months. She and I are sexually active and occasionally do the fun over the phone. But recently she told me she wants me to start sexting with other girls too because she thinks it's hot. I just don't know where to find girls for that... Thoughts?
My girlfriend wants me to do this.. I'm not sure/options?
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