WTF is all that?

It's pretty much the few legit orientations and then a bunch of fetishes, kinks and then flat out nonsense like this:
Multisexuality: a sexual orientation wherein one is only attracted to members of multiple systems. In some cases, a multisexual is only attracted to one member of a system; in others, they may be attracted to several members of the same system, to everyone in the same system, or to people from separate systems. One thing all multisexuals have in common, though, is that they only experience romantic or sexual attraction toward members of multiple systems.

I just...