3D Polygon

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I think it is a good masturbator. Here's what I found in my use of it.
It has gentle stimulation. Fairly standard, but not a bad thing, great for edging.
With lube, this thing is SLIPPERY! You need to keep a good grip on it, but it is a nice, smooth experience once you get the hang of it.
Might give you cancer. There is a warning that says it may/does contain BPA, and that is a know carcinogen. Not good!
Also good for big dicks, as it's nice, stretchy, soft, and bigger than it seems. (For context, I'm 6.8 inches, and 2 inches girth/5.8 inches circumference.)

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Great for jerking off or holding it under a pillow or something and humping it. I've bought several of these and they're great. With a proper seal for suction, I've had some better climaxes with these than with real women.

Only con (and this is just physics, not a design flaw imo) is that if you manage to slip out during use, it can be really difficult to re-insert now that your member is all lubed up. So hold it tight ;)

The Tenga line is amazing, like erotic, functional art. I'm amazed something that looks so sculptural can provide such intense stimulation. Wonderful product.

It's a pleasurable experience, like t*t fr#*.. a well endowed woman, you might get lost in the billowing softness before you achieve your orgasm.