An automatic or vacuum pump can be not so much a sexual toy as a means of keeping the penis in good shape. The device works as follows: the penis is inserted into the flask, and then air is pumped out of it. A negative pressure zone appears inside the device, causing a strong artificial erection. Also, the penis temporarily increases in size, and its sensitivity is enhanced.
The main thing is to use the pump with caution and follow the instructions. For example, you cannot use the device for too long: this can lead to numbness, decreased sensitivity and unpleasant sensations. It is also worth remembering that excessively frequent exercises with a pump can lead to a weakening of an erection.