My Ex and I Hooked Up. One Part of Him Seemed ... Smaller Than Before.
Briefly

Penile shrinkage can be a lasting change rather than a temporary one. Common causes include Peyronie's disease, weight gain, prostate surgery, and erectile dysfunction. The loss of spontaneous and nocturnal erections is thought to impact penile health, as these erections help maintain size. Infrequent sexual activity may not provide enough stimulation for healthy blood flow, which could contribute to shrinkage over time. The perceived size difference can also be attributed to psychological factors or memory distortions.
Shrinkage is, indeed, a thing—and it can be way longer lasting than the situational kind. Usually the change isn't too drastic, but it may be observable.
There are a few known causes for this, which include Peyronie's disease, weight gain, and prostate surgery. Another culprit: erectile dysfunction.
The thought is that the shrinkage occurs due to the loss of spontaneous and nocturnal erections. This nourishing blood keeps the penis healthy.
The every-so-often erections guys get for intercourse wouldn’t be enough to support good penile health and would lead to the shrinkage.
Read at Slate Magazine
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