Is a stranger more sexual attractive than acquaintance?

Women are more likely to have one night stands with guys that are not in their social group, because this creates less drama

It's not so much that the guy is more attractive, (although he is because of the mystery and he also knows her less well so he seems less clingy and more manly and dominant which is attractive), but again, the MAIN THING is because he doesn't know her friends, and her friends don't know him, so she can sleep with him without being judged