Let's face it, eventually we let our lust get the best of us. The question here is if you're okay with it or not and if you would do it again.
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Only reason I voted for "its wrong" is because I've been in a relationship for a pretty long time, if you are single and the other person is too and you both want to have a little fun for the night, there isn't anything wrong with that. As long as both parties included KNOW that this is all it will be is just one night. In the right circumstances it is okay.