Is kissing someone of the same gender cheating if it didn't mean anything?

El
Senerio: As a straight person, you're dating someone of the opposite gender. If you kiss someone of the same gender as a dare or something, do you think it's considered cheating? Even if you don't have feelings for them?
What if someone did it out of curiosity? Or if the person in the relationship was not straight, but instead bi? What if the person in the relationship was straight, but the person they kissed was bi?
Some people think it is and some think not. It's debatable. Explain your answer!

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