Am I cheating on my girlfriend even though she watching?

First off I am and would never cheat on a girl I am in a relationship with but lately my girlfriend is bringing girls home and want me to have sex while she sits in a chair Orr at the foot of the bed and watch. I kinda feel like I am cheating on her but she enjoys and turns her on me going to work on another girl. She does sometimes join in when she is really turn on and wants to have fun with the girl and me. So am I cheating on my girlfriend even though she watching?

Am I cheating on my girlfriend even though she watching?
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