Autoeroticism

Autoeroticism is the practice of filling one's own sexual needs without a partner. The most common form of autoeroticism is masturbation. Many people also use dildo?s, vibrator?s, [anal balls]?, [sybian machine]?s, and other [sex toy]?s alone.

One particular practice which is often practiced alone is autoerotic asphyxiation. It is a dangerous practice, particularly when done alone.