Bryan Johnson's tweet sharing data of his son's erections has sparked mass outrage online.
The 47-year-old tech and media mogul has been branded both 'weird' by his followers after making an explicit reference to his son's overnight erections.
For those unfamiliar with Johnson's work, the multi-millionaire is famed for investing $2 million dollars (about £1.6m) a year into conquering the process of aging.
After selling his payment gateway Braintree - which allows customers to pay online using credit cards, debit cards, Apple Pay, Google Pay, and Venmo - to PayPal (then part of eBay) in 2013, the Utah-born entrepreneur received a staggering $800 million (roughly £633m) pay cheque.
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It was then that he began focusing on achieving perfect health as part of an organisation titled Project Blueprint in numerous strict ways.
As well as waking up at 5am, spending 4-5 hours on 'concentrated thought', undergoing daily health tests and becoming a vegan, on the last year alone, the biohacker revealed he'd begun injecting other people's fat into his face to provide a more youthful, rounded appearance.
Naturally, part of Johnson's life's work is research - a vast proportion of which he shares on social media.
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And this week, the father-of-three has been accused of 'grossly' oversharing by exposing data tracking of his son Talmage's erections.
Taking to Twitter on Wednesday (22 Jan), Johnson shared a series of computerised screenshots with data from an overnight erection-tracker machine, which measured both his and his son's.
As well as measuring the average duration of the pair's erections, he data showed the quality of each erection, and their overall sleep efficiency.
"His duration is two minutes longer than mine," Johnson tweeted. "Raise children to stand tall, be firm, and be upright."
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The explicit research commentary has since landed him in some hot water, with many of his followers expressing both their horror at Johnson for posting this information on social media.
"For the love of God, why would you post this on the internet publicly? I feel bad for your son," one X user responded (via news.au.com), while another wrote: "I have a feeling this won’t even crack the top 10 most disturbing chapters in your son’s inevitable autobiography."
Some even urged Johnson to remove his post, with one writing: "Still time to delete this buddy."
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A fourth said: "Don’t listen to the haters Bryan. Knowing the details of your son’s erections is perfectly normal, and, quite frankly, it would be weirder if you didn’t post about it."
However, Talmage quote-tweeted his father's post, writing: "I'm grateful for the way my dad has raised me."
This isn't the first time that Johnson has included his son into his work.
As part of a prior research project in 2023, Talmage was used as the tech boss' 'blood boy', providing his father with a litre of blood to be transfused as part of a plasma-swapping treatment.
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However, Johnson later said he wouldn't be continuing this practice as 'no benefits' were detected during the process.