Utilizing high-frequency pulses to stimulate nerve endings.

Creating a vacuum-like effect to mimic natural sensations.

Most modern devices utilize a combination of three primary mechanisms:

Providing rhythmic, longitudinal movement (the "stroking" action).

Finding information on "male milking machines" often leads to two very different worlds: used in fertility clinics and lifestyle/novelty products used for personal wellness or recreation.

Look for "body-safe" materials. Medical-grade silicone is the gold standard because it is non-porous, easy to sanitize, and won't harbor bacteria. Avoid "jelly" materials which can contain phthalates.

If you are looking to purchase one, keep these three factors in mind:

Since these devices involve internal chambers, they must be easy to disassemble. A device that is difficult to clean is a hygiene risk.