This "fundamental right to consequence-free sex" is just about the most asinine, preposterous thing I have ever heard.
This is like saying "I have a fundamental right to have a great time getting absolutely blitzed drunk without the consequences of a hang-over." You can pace yourself and hydrate and drink Pedialyte before and after, and maybe you can avoid the hangover. But you might get the hangover. That is the risk you run.
Or "I have a fundamental right to gorge myself on decadent food without any consequences." Well you can try do exercise to offset the consumption. But there is also the chance you put on weight or damage your heart or get diabetes. That is the risk you run.
Life is full of consequences. Everywhere. You just have to do a cost/benefit analysis to decide if that is something you really want to do. The hangover? Yeah those suck but they go away after a day or so, so maybe you get drunk anyway. Sex? Amazing. Great. Fun. But getting pregnant? Well that's a pretty flipping big consequence that maybe you have to fully grasp the magnitude of. And if you don't want to run that risk of having a child, then maybe you need to explore other options to having a good time.
But a fundamental right to life doesn't exist?
It does exist, and that right is granted to you at birth.
Where does the "fundamental right" to consequence free sex come from?
It doesn't "come from" anything, I just think it's a good idea. I used my own internal moral compass to reach this conclusion.
So it is something that you just made up. Jesus....