Why do straight girls kiss each other on dares or makeout?

Why do straight girls feel comfortable enough to kiss or makeout for fun or dares? I get that it can be for the thrill of it and an "in the moment" thing but as a straight guy I could never do that with another guy lol. My girlfriend French kissed another girl for several minutes before we got together for fun as part of a dare but isn't French kissing a little too intimate to do just for fun even if dared? As a straight guy I could never do that with another guy ever lol. Are girls just more comfortable with each other than guys?
Why do straight girls kiss each other on dares or makeout?
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