Tenga Flip Hole, White
Trust the Japanese to create a high-tech male masturbator that blows away the competition. This toy opens up completely giving you access to the insides to apply lube before use and then to wash it out after use. There are multiple textures and 'pleasure zones' on the inside, so the deeper you reach, the more you'll feel. Three buttons on the outside allow you to control the suction and pressure inside as you use it. The case also doubles as a stand to hold it open so it can dry out completely before you put it away. It comes with three different lubes for your pleasure.
See it in action (in Japanese):