September 21, 2026, 8:04 am | Read time: 3 minutes
Bryan Johnson, 49, is obsessed with longevity. The U.S. entrepreneur has structured his entire daily life around staying as healthy and biologically young as possible. He monitors his sleep, diet, and blood values—and takes it a step further with his body: Johnson even measures his nocturnal erections and has his sperm analyzed.
Johnson publishes his extensive “Blueprint Protocol” online. It documents numerous metrics and measures related to his health, including sexual function and fertility.
What Nocturnal Erections Can Reveal About Health
In his post “How I’m de-aging my penis,” Johnson explains why he monitors his nocturnal erections. Healthy men regularly experience erections during sleep, which are linked to nerve and blood vessel function and can provide insights into physical health.
Johnson measures not only whether an erection occurs but also its duration and strength. He reports a total of 3 hours and 14 minutes per night. Johnson considers this value part of his longevity program.
However, it’s important to note: A longer nocturnal erection does not automatically mean a longer life. His personal metrics are not proof of an anti-aging effect.
Bryan Johnson’s Sperm Are Measured
Johnson also regularly checks his fertility. In his “Sperm Health Protocol,” he publishes results from several semen analyses. According to him, his sperm concentration was 143 million per milliliter, with a total count of 380 million. For comparison, the World Health Organization cites 16 million sperm per milliliter as the lower reference limit for sperm concentration. Johnson’s value is nearly nine times that.
Over five tests within three months, his average count of motile sperm was 165 million. Johnson attributes his good numbers to his overall lifestyle, which includes adequate sleep, exercise, strength training, and avoiding alcohol and cigarettes. He also tries to avoid excessive heat in the testicular area.
Again, these are personal values from Bryan Johnson’s self-experiment and not a guarantee that the same measures will yield the same results for other men.
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What Does Sex Contribute to Longevity?
Bryan Johnson believes that sexual health is an important component of a long and healthy life. In an interview with GQ magazine, he even said, “I think sex is related to longevity.” He also believes that more sex can generally be better for health.
However, this statement should not be confused with scientific proof. Johnson’s personal measurements do not imply that more sex actually extends lifespan.
His approach shows how thoroughly Johnson monitors his body: sleep, diet, fitness, blood values, hormones—and also erections and sperm. For him, sexual health is not a taboo topic but another area he wants to measure and optimize.
What Is Scientifically Valid About This?
Part of his strategy is based on known correlations. Nocturnal erections can indeed provide information about nerve and blood vessel function. Factors such as sleep, exercise, smoking, and alcohol can also affect male sexual and fertility health.
The big question is whether this really leads to a longer life. There is no evidence for this in Johnson’s personal program. Ultimately, it is a large-scale self-experiment—interesting to observe but not equivalent to a clinical study.