"It's between consenting adults" works well as a legal argument, and I'm pleasantly surprised to see at least some posters restraining themselves to using it as one, but as a moral argument it's too presuppositional of a generally libertarian and individualistic moral framework to convince anybody who doesn't share those presuppositions.
Immoral is a strong word. For someone who is not a Christian (or Muslim, or Orthodox and Orthoprax Jew - but I think Jews would overall be less likely to emphasize the immoral aspect of it-), consent just seems the most logical basis on which you can judge the morality of it.
Yeah, I mean, coming from a totally non-religious perspective, I don't understand how something could possibly be immoral if it has absolutely no negative impact on anyone or thing - as far as I am concerned, something is moral or not depending on the impact that it has; things aren't inherently moral or not by themselves.
If two people consent to pre-marital sex, even if it totally devoid of any emotional connection, it doesn't actually have any impact on anyone outside the couple, so I don't see what rationale there could be for it being immoral.
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