The easiest way to get away with rape is to rape either a prostitute (since she won't report it cause she'll also he arrested and she won't have proof you raped her), or some kind of disabled or retarded woman like an old woman with dementia. There's also the classic roofie a girl at the bar strategy but you're more likely to get caught doing that, also it's somewhat more boring cause she'll be asleep or nearly asleep during it. If you can find a mute disabled woman like in a wheelchair or something and rape her that's another good option, you just have to make sure to not let anyone see you. You could also rape just a random woman off the streets but it would take a ton of planning in modern times with all the camera and forensic tools and shit.