How do you know when enough is enough?

That's when I first realized it. I was in an S & M relationship 


with Mr. Big.

In love relationships, there is a fine line between pleasure and pain.

In fact, it's a common belief that a relationship without pain...

...is a relationship not worth having.

To some, pain implies growth.

But how do we know when the growing pains stop...

...and the “pain-pains” take over?

Are we masochists or optimists, if we continue to walk that fine 

line?

When it comes to relationships...

...how do you know when enough is enough?