Though it may seem painful, those involved find that the pleasure outweighs the pain. According to experts, the pain is supposed to be received or given in love and is not to be viewed as cruelty.
Sometimes these acts are not done within a sexual context. In these cases, the person just enjoys the thrill of being helpless or taking on a role of power and control.
The human body is constantly releasing chemicals and hormones that affect the feelings we experience with sex and love, but also pain and violence. When a person's body is sexually aroused, her tolerance for pain becomes higher due to the endorphins (a natural hormone that acts as a pain reliever) released. Therefore the pain that some experience turns into a pleasurable feeling.
