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Since it says “girlfriend/boyfriend”, I have to go with “YES”, because you shouldn’t have premarital sex, because you’re basically cheating God/Jesus/Alah/Jeovah/Whatever deity you believe, as long as said deity forbids premarital sex and if not, what kind of lame-ass, stupid and permissive deity allows people to have sex whenever they want???!!!
What if you rape your girlfriend/boyfriend? Is it cheating since your girlfriend/boyfriend didn’t give you permission to have sex with the person you had sex with?
Yes.
If you’re having sex with your girlfriend, that means you’re cheating on your boyfriend, and vice versa.
What if both of you do it with your eyes closed? If you can’t see her, are you really banging her?