Clitoral pumps and pussy pumps are suction devices that are meant to cover all or most of the labial area (vagina lips and clit) or just the clit for the clitoral pumps. Both operate in a similar fashion where they create suction. This causes the blood to engorge the clit or vaginal area making it more sensitive. Once you release the pressure the area will stay plumped up for a short time before returning back to normal, this is not a long-term effect. Some pumps even come with the added bonus of stimulators and vibrations to provide pleasure post pump!