We get married because we pair bond.  that's human nature, not insanity. 

One the scale of 'out there' this is waaaay waaaaay out there.  I cannot imagine biting someone else's finger tip off.  I can't even imagine cutting someone else for sexual pleasure or gratification. 

I have no issue with what consenting adults do to each other, that's their gig, their decision.  However....I do think that we ought to start calling things as they are.  If getting smacked around gets you off then that's great, but don't try to pretty it up by giving it a fancy name.  It's violence, plain and simple.  Like I said, if that's what satisfies you sexually, then that's fine...but just say that getting beat up gets you off, don't try to sugar coat it.

So, these guys got a kick out of biting and being bitten....

http://human-nature.com/ep/articles/ep01138154.html

There's a very good essay about man/woman pair bonding and why it happens. 

I'm thinking that it's a bit extreme too.....

Well, that's true....although I think that 'normal' is a good way of describing it.

Or cutting someone else up for sexual gratification and getting off at the sight of their blood.  Apparently there are people who like that too.  That e-zine that I linked to has a few of those.

I know.  That's what I said too.

Yes, I did, and I'm going to reply this weekend...been pretty bad about responding to emails of late...sorry!

Here's a thought.....society can put people on a mental health hold because they're a danger to themselves and/or other people....would you consider biting someone else's finger tip off and allowing someone else to do the same to you as a 'danger' to yourself and other people?

I agree, but...how is this different than S and M?  Apart from the degree, I mean.  Isn't it along the same lines at that?