There is nothing more complex about non-meaningful sexual contact - in fact it is primitive and make us beastly. We're human and shouldn't subscribe to such beastly and animilistic norms.
Why is it wrong/immoral? Well, it's apparent: in my perception of the world, sheltered and naive as it be, there's such a thing as love, and you cheapen it, as well as one of its most intimate expressions, sexuality, by making the latter a common, dirty and meaninfless thing, you ultimately cheapen yourself. I miss the days when coyness and chastity were virtues, and were loved ones would preserve themselves for each other, instead of corrupting themselves with the sin.
Just "having fun" invariably leads to people becoming people I don't like, I have seen it often. They start viewing people no longer as persons, but merely as sexual objects and have no sense of responsibility or attachment left.
Well, logical reasons, Kraszu? That's difficult for me. It's just how I feel, you see? It's just my sense of morality. But if you wanted a logical chain then maybe...
IF you have fun THEN you lower the value physical expressions holds [that value having been reached a sense of rarity, specialness and exclusiveness]. IF you lower the value of physical expression of love THEN you cheapen your partner thus that you can no longer give him this form of appreciation, at least not in the quality that it would have hold had you not lowered the value of it.
Of course if you and your partner are immoral beasts that think sex should be meaningless and "just having fun" is okay, fine. You can be beasts, wild animals if you like. I, myself, cherish being a human, and more than an ape who just looks for the next hole to fill.
Why do you even care? You could care less what people think about you, least of all me. We'll all reap what we sow, one way or another.
