They are two sides of the same coin, one not existing without the other. I can show you how pleasurable
pain can be. You don’t believe me now, but this is what I mean about trust. There will be pain, but nothing that you can’t handle. Again, it comes down to trust.
- 50 Shades of grey bye E.L. James,chapter 13, page 156

(Source: rebirth-of-the-slender-halfling)