The Womanizer Duo 2 Oil Blue Stimulator is a sex toy that combines clitoral stimulation with penetration. To use it, it is recommended to apply water-based lubricant to the intimate area, turn on the stimulator and place the suction nozzle on the clitoris. The penetrating part can then be inserted into the vagina and the intensity of the vibrations can be adjusted according to preference. It is important to follow the manufacturer's instructions and clean the product before and after each use.