Boy, there's a bunch:

Harness: Used to attach a strap-on.
Lubricant: Lotion that is designed to enhance slipperiness.
Marital Aid: Any sex toy.
Massager: A vibrator
Masturbator: A device used by men to assist in masturbation. Nipple Clamps: Small clips designed to be attached to the nipples.
Penis Pump: A vacuum erection device.