Commonly called a "penis pump", a vacuum erection device, or VED, creates negative pressure that expands and thereby draws blood into the penis.[13][14] Medically approved VEDs, which treat erectile dysfunction, limit maximum pressure, whereas the pumps commonly bought by consumers seeking penis enlargement can reach dangerous pressure, damaging penis tissue.[15] To retain tumescence after breaking the device's airtight seal, one must constrict the penis' base, but constriction worn over 30 minutes can permanently damage the penis and cause erectile dysfunction.[16] Although vacuum therapy can treat erectile dysfunction sufficiently to prevent penis deterioration and shrinkage,[14] clinical trials have not found it effective for penis enlargement.[17][18]
The penis reaches adult size over a number of years during puberty (the years during adolescence when boys and girls grow and change to become adult men and women). A boy who matures more slowly than his friends will not get an adult-size penis until late in adolescence – and this may cause anxiety or make him feel as though he has an abnormally small penis.
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