Potential sex partners are sometimes very willing and cooperative. Potential murder victims not so much. In fact, they may attempt to kill you in self defense. Afterwards, the rest of society will want you behind bars for a very long time.

If you are sexually clueless and try anyway, it's embarrassing and you go have a good cry and write about it in your diary. If you have no idea what you are going and try to kill someone, well, there's still that issue that they may fight back and then the cops get called afterwards.

I think there are a few holes in your theory. Repeating it to me over and over doesn't fill them in.