Penis pumps are used for a variety of reasons, including:

1. Treating erectile dysfunction: Penis pumps can be used to treat erectile dysfunction by creating a vacuum that increases blood flow to the penis, resulting in an erection. They may be used alone or in combination with medications.
2. Increasing penis size: Some men use penis pumps to increase the size of their penis. While pumps can temporarily increase the size of the penis, they do not provide permanent results.
3. Improving sexual performance: Using a penis pump may help some men achieve a firmer and longer-lasting erection, which can improve sexual performance and satisfaction for both partners.
4. Post-surgical use: Penis pumps may be recommended for men who have undergone surgery or radiation therapy for prostate cancer, which can cause erectile dysfunction.

It's important to note that penis pumps should be used safely and in accordance with the manufacturer's instructions. Overuse or misuse of a penis pump can cause side effects, such as bruising, pain, and numbness. Additionally, penis pumps do not address the underlying causes of erectile dysfunction and should not be used as a long-term solution without consulting a healthcare professional.