What's normal? Ok, let's define what "norm" is at first: Social norms are described by sociologist as being laws that govern society’s behaviors. Basically, "norm" is a set of unspoken laws everybody agree to follow to make their lives easier and not to kill each other too often. Then there are also written laws, such as Criminal code for example. Sometimes they overlap. Like, it's normal to think that murder is wrong and the criminal code says the same. In biology, norm (standard) is a set of guidelines which is used to ensure that the animals conform to the specifics of the breed/species.
So technically, "normal" is something that was taken as a standard which everyone are supposed to follow, though we must keep in mind that definition of "normal" can change with time.
I guess you have to define normal first. Most people are "normal" in certain aspects through consensus. (For example, believing that murder is wrong is "normal"), but normal in a broad sense, not so sure.
...what? I'm not really seeing where you're going now. Are you implying that thinking that murder is wrong is the because of societal rule?
People adopt a majority view for a reason: because it works and has worked for thousands of years. If someone goes and has sex with horses it isn't because he's free of societal rule, it's because he's an absolute moron.
I find it like this, "If I am different from you, then you are different from me. So if we are both different, what's normal? There is no such thing as normal since we are all different and we all have different P.O.V's on what normal is. Being different is normal within itself, but normality is difference altogether."