(what is an onacup?)

original: "With the adoption of a flexible body, a range of stimuli to the penis head is now possible, including back-and-forth, right-and-left and rolling movements.
You can also enjoy motions that you have never before experienced - a combination of rolling motions at the top and piston movements at the base. A new sensual sensation is also yours as you stimulate the sensitive head during and after ejaculation."
We say: You can squeeze it, you can pump it, you can stroke it.

Onacups (also known as onanism hole) are ment for single-use and can only be used a few times (by cleaning them or simply wearing an extra-thin condom).