A biohacker who is blowing $2 million (£1.6 million) a year trying to reverse his biological age is trying to rewind the clock for his manhood too.
Bryan Johnson, 47, clearly believes that you can't put a price on longevity in this life, hence why he's on a mission to override the ageing process.
The venture capitalist, who dubs himself 'the world’s most measured human', launched his 'Project Blueprint' after suffering a health scare in 2020.
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On top of that, he had $800 million (£642 million) burning a hole in his pocket after selling his payment gateway company Braintree Venmo to PayPal in 2013, so he invested his cash into himself.
Johnson has been measuring each of the 70 organs in his body in a bid to 'maximally reverse' his quantified biological age.
His unique experiment was recently the subject of a new Netflix documentary, Don't Die: The Man Who Wants To Live Forever.
Take a look at the trailer for it here:
Each day, Johnson shoves dozens of pills down his throat and follows a strict diet which consists of the same food, while a team of medics monitor his progress.
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A stranger segment of Project Blueprint is the seven step process which the entrepreneur from Utah follows to try and 'de-age his penis'.
Johnson claims he has been able to lower his 'erection age' by over half thanks to this longwinded ritual.
As well as keeping track of his own 'erection data', Johnson has also been controversially comparing the stats to his 19-year-old son's.
The biohacker reckons it's very important information to collect, because 'men with erection problems are 70% more likely to die early compared to those without'.
Explaining why he believes nighttime erections have a huge effect on the health of a bloke's penis, Johnson said: "It's a classic case of 'use it or lose it'.
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"Think of nighttime erections as how your penis works out," he said. "Erections keep the tissue healthy by bringing in oxygen-rich blood - the more they last, the better.
"Without these regular exercises, the penis can develop scar tissue over time, making it harder to get erections."
Johnson claims 'healthy nerves, good blood flow, high sleep quality and balanced hormones are essential factors for a healthy penis.
So, how does he measure how well his little guy is doing?
Semen analysis
Johnson starts off with 'semen analysis', which involves regular testing of ejaculate to look for changes in sperm count, motility, and morphology.
Measuring erections
Next is a 'measurement of nighttime erections' with a Fitbit-like smart device, which fits around his penis, and takes readings of how many times he gets hard throughout the night.
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Johnson says this provides an indication of 'physiological cardiovascular and sexual vascular health'.
Blood flow testing
An ultrasound is then used for 'blood flow testing', which measures how much blood is getting to his penis.
Urine testing
Johnson also tests his urine for similar reasons, saying that making a note of his 'max urination speed' let's him know everything is all good with his urinary health.
Questionnaires on sexual function
This is followed up by 'questionnaires' to score his sexual function, while he also regularly measures the size of his prostrate.
Following core health practices
The sixth step is following 'core health practices', which he describes as prioritising quality sleep, eating a balanced diet and regularly exercising.
Prostate health
The final step follows on from the last one as it's all done through the Adam Health sensor, which provides detailed metrics of a penis' activity during the night.
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These results then work out your 'AndroAge', which lets you track how effectively you're measuring your penis and erection health.
Johnson's is below 20, even though he is 47-years-old.
As to why he does all this, Johnson explained that he was inspired to go on this bizarre journey after living among 'extreme poverty' in Ecuador when he was 21-years-old.
"I felt really compelled to want to do something that would improve the world," the biohacker told People. "I didn't know what.
"So the goal became make a whole bunch of money by age 30, and then with that money, find something interesting to do."
Johnson did exactly that and went on to invest $100 million (£81 million) in 'synthetic biology, genomics, nanotech' while building a brain interface.
He claims this is the 'world's best way to easily and robustly measure the brain', while he 'measures himself' with Project Blueprint.
"And it all kind of came together into this one simple thesis, which is, don't die," Johnson added.
Maybe he really is onto something then, eh lads?
Topics: Bryan Johnson, Health, Science, US News, Weird
Olivia Burke