Consider also Chapter 23 of The Goblet Of Fire (and its equivalent movie scene), wherein, during the Yule Ball, Snape catches couples making out and punishes them by docking house points. If Snape hadn't wand-blocked them, they presumably would have gone further in their games of Hide the Flobberworm. And that's just one incident in a chapter that's more about relationship drama than it is the main plot. Hogwarts students are no strangers to teen romantic angst, and I doubt that they're all going through that emotional stress just for a peck on the cheek.
So it's safe to say that Hogwarts students f**k. But do they f**k in the Room of Requirement? The Room appears when someone "needs" something, but can it ever be truly said that one needs to f**k? However, like many concepts in Harry Potter, "need" is ill-defined at best. That means we're going to have to define it ourselves.
Let's examine the scenarios in which the Room has appeared. In Hallows, students face immediate and brutal, albeit non-lethal, physical threats. The Room also acknowledges Neville's need that the Death Eaters and their followers must not be able to access the Room and discover them. Draco pulls the same trick when using the Room to plot Dumbledore's assassination in Half-Blood Prince, ensuring himself privacy. This implies that the Room is indifferent to the morality of what occurs within it, assuming that it even understands the concept.
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The question of whether the Room can be considered sentient will be covered in part four of this investigation.