Why would the two be mutually exclusive? Say I come up to you, tell you I'd like to have sex with you, however I have had, do have and likely will have many partners besides you. If you say OK, we find a place to get it on. If you say no, I bow politely and disappear into the mist. What's unethical about that?

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Not Intolerent, Just Clueless
Ruler of Rugby, Patron Saint of the All-Blacks, First Among Equals in California
Official SiP Forum Poop-Face, Killjoy and Inventor of BiPs -- My Finest Creation
Not Bambi, not Tambi, I'm the EVIL Baker.