Humans are unlike most mammals in that we don’t have an actual, literal pubic bone. Erections are maintained solely with blood pressure. Certain muscles relax, allowing more blood to flow into the corpus cavernosum – the spongey flesh that takes up most of the space in a penis – and then other muscles clamp down so that it’s difficult for blood to flow back out. That causes blood to fill up the tissue, swelling it up like a balloon.
The pelvic floor muscles are all part of that group. Although you don’t have full voluntary control over the muscles that control erections, doing kegels still helps flex those muscles, strengthening them just like doing any other exercise. When it’s time for an erection, those muscles will be able to flex harder and clamp down better, and they won’t get fatigued as quickly. That makes it easier to maintain an erection for longer.
If you practice kegels while engaged in sexual activity (alone or otherwise), you may notice that – especially when you’re getting close to climax – flexing those muscles can delay climax. It’s kind of like the trick to get rid of an unwanted erection by flexing the muscles in your thighs: it diverts blood, concentration, and nerve signals away from the area. Flexing your pelvic floor muscles can clamp down on the urethra, just like you’re holding urine in your bladder, and prevent ejaculation, which usually delays climax as well.
EDIT: for more sex ed, I recommend [Sexplanations](https://www.youtube.com/@sexplanations) on YouTube.
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