Erotic toys that help to improve the blood supply to a given part of the body and thus increase its sensitivity are called vacuum pumps. There are special breast/nipple, penis, vagina pumps and possibly universal vacuum kits (not just for therapeutic cupping). Many of these pumps have stimulating projections or vibrations. Some innovative pumps use water pressure instead of air pressure, thus greatly improving the effect on male erections.
Vacuum pumps - reviews and tests
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