Experts have revealed what the human penis of the future could look like, given how it appears to be evolving naturally - as well as with a little help from science.
What happens below the belt can often be a bit of a taboo subject, though one that fascinates many people.
Size is often a big fixation for men more so than women, but data has shown they needn't be too worried as average sizes have seemingly increased at an alarming rate in the past 30 years alone.
According to the Daily Mail, the average penis size has shot up from 4.8 inches in 1992 to 6 inches in 2021.
And while that may seem like great news, it actually could be quite the opposite if the male genitalia keeps inflating at such an enormous rate.
According to the 2023 study by Stanford University which looked at penis size in 55,761 men, this "alarming rate" of growth - 25 percent up in length in the last 30 years - could mean that the average erect penis will stand at over 8.5 inches by 2100.
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Researchers have hypothesized that it's not evolution at play, however, but rather environmental factors that are causing the growth, such as pollution or certain lifestyle habits.
Stanford’s Michael Eisenberg, lead author of the study, explained: "If we’re seeing this fast of a change, it means that something powerful is happening to our bodies."
That rapid increase could spell further bad news for birth rates, as scientists have predicted it could cause problems for the female anatomy, which may not be able to accommodate the change.
"That would definitely have a negative impact on reproductive success," revealed Kris Kovarovic, a researcher at Durham University’s Department of Anthropology, who added: "and smaller penises would likely be selected for."
Simon Underdown, professor of biological anthropology at Oxford Brookes University, revealed that modification could soon be possible too, explaining: "If there is enough demand, driven by fashion or societal trends, for tweaking bits of the body then we’re probably not that far away from being able to genetically do that.
"That’s what makes humans really interesting — we’re close to the point at which we can mess about with biological processes because we want to rather than there being a strong biological selective pressure."
Scientists could also look at improving the motility of sperm, enhancing their shape or movement to make them more likely to penetrate the egg's cell membrane.
Conversely, for those hoping to avoid pregnancy, scientists are also exploring nano-technology to create a built-in contraceptive system that could be turned on and off when required.
According to Canadian bioethicist George Dvorsky, robots the size of a red blood cell could be designed to block the passage of sperm through the vas deferens when needed.
He told Gizmodo back in 2015: "Or, the nanobots could be on the hunt for sperm-specific proteins, and take evasive action."
Dvorsky also theorized that wireless internet technology could also be used to increase pleasure by increasing the sensory link between the brain and the penis.
Rich Lee, CEO of the company Cyborgasmics and self-proclaimed “Elon Musk of sex tech,” has also been exploring the possibility of a pubic implant which could make the penis vibrate like a sex toy on demand, dubbed the Lovetron 9000.
He told New Atlas in 2017 that he would be testing out the device on himself first, havng already implanted several experimental devices into his own body.
Unfortunately, if you fancy getting one yourself, the Cyborgasmics website stats that the Lovetron9000 vibrating pelvic implant is still "coming soon" despite the idea first being pitched over five years ago.
Scientists have also revealed that they consider the human penis to be "dull" in comparison to that of other primates such as chimp and lemurs, as it doesn't have any lumps, ridges, or kinks, or any unusual features.
Dr Emily Willingham, author of Phallacy: Life Lessons from the Animal Penis, told the Daily Mail that humans have "fairly plain penises" in the animal kingdom, with evolution favoring increasing the size of the brain rather than the penis.
She explained: "We went our separate evolutionary, genetic and behavioral ways from our closest living relatives at least 6 million years ago.
"We are on our own and are our own lonely species, but what's clear is that in shaping us, nature favored our brains over ... well, a lot of other things."
So, while robotic vibrating penises that can witch off their sperm supply on demand aren't here just yet, there's a high chance some of these advancements aren't completely off the table for the future.