If you're defining it differently with every generation, it's transparently socially created. Rape has been named and defined over and over different ways by different societies. You thinking you have the objective, observationally correct definition in this moment of 2025 defies reason and history. You do not live at the end of history, when we finally have the chance to see things as they are in a way that will never change again.
Trying to act like all societies have these and they're universal, rather than being deliberate and intentional changes to society constructed by the people within it, is insane. And the fact that we have socially constructed these ideas means that yes, they could be dismantled by others. In fact, that's WHY it's worrisome that someone immoral or evil could take over politics: because if currency is socially constructed, they could conceivably get rid of it. Because if the moral and legal idea of "rape" is narrowed, suffering could be the result. Of course, if the idea of "rape" is enlarged, suffering can also be the result. In the year 2300, it'd be possible for the definition of rape that people thought was simply natural and observable to be "well, you need to fill out the Sex Forms in triplicate and upload them to the cloud first, or it's obviously rape," or if society goes a very different way, "well, if she's your woman by right of conquest, she's yours, but if someone tries to take your woman, that's rape and punishable by death."
Now you can say from your 2025 perch "well, the person who didn't fill out the forms in triplicate isn't a rapist even if society says he was, and the person who takes a woman by conquest is obviously a rapist whatever his society says," but that just proves your social vantage point has a serious impact on this. This is literally why some societies are better than others. If it wasn't for social constructs, we'd all be identical. Claims at moral/ethical or lifestyle superiority are all made based on socially constructed discrepancies between places, social classes, races, etc..
That's what it is to be a social construct. Universals don't need to be fought for and legislated about.