Articles

Research-first writing on sauna, heat, fertility, and men's health. What the evidence actually says, claims examined.

1,800 Years of Advice on Conception Positions, Built on Almost No Evidence
When a couple asks which sexual position gives the best odds of conceiving, they expect a ranked list. What they get from me is a shrug. Soranus of Ephesus was telling patients to stay flat after sex almost two thousand years ago, and we still do not have a single controlled trial showing that missionary, rear entry, or any other position changes the chance of pregnancy. The most quoted study on staying flat comes from intrauterine insemination, where a clinician has already done the hard part with a catheter. That... Read more...
Exercise Intensity and Sperm Production: The Inverted-U Curve the Data Keep Finding
Exercise intensity and sperm production follow an inverted U. A 2015 cohort study in the British Journal of Sports Medicine followed 1,215 young Danish men and found that those who reported more moderate physical activity had higher sperm concentration and total sperm count than those who reported little activity. The same study linked heavy television watching with lower counts. That part gets quoted often. What gets skipped is the shape of the relationship. The advantage flattened and then reversed at the high end of training.Most coverage stops at "exercise is... Read more...
Sauna Installation Cost Calculator: Your Real Cost Is Price Per Session
Finnish men who sit in a sauna 4 to 7 times a week had a 40% lower risk of dying from cardiovascular disease than men who went once a week. That finding comes from a 20-year study of 2,315 men published in JAMA Internal Medicine (Laukkanen et al., 2015). The relationship was dose-dependent. More weekly sessions tracked with lower risk, after adjusting for smoking, cholesterol, and physical activity. A sauna installation cost calculator will not mention this. It will hand you a sticker price and stop there. The number that... Read more...
Male Fertility Counseling Was Built for a Problem That Changed
Sperm concentrations in Western men fell roughly 51.6 percent between 1973 and 2018 (Levine et al., Human Reproduction Update, 2023). That is not a typo. The meta-analysis pulled data from studies across six continents and found the decline has not leveled off. Yet when a man walks into a fertility counseling appointment, most sessions still focus on emotional support and assisted reproduction, while the modifiable factors behind that decline get a sentence or two at most.Most male fertility counseling still follows an older script. A man gets a semen analysis,... Read more...
How to Install Infrared Sauna Panels: Mounting Height Is a Dose Control
Most infrared sauna panels get hung like picture frames. That is the wrong way to think about them. When you mount a panel, you are choosing where radiant heat lands on a body. The height of the panel on the wall changes the dose. Move a panel up eight inches and the shoulders and upper back absorb it instead of the lap. Same wattage, same room, different session.This guide covers the install work step by step. Wiring, mounting, placement, and testing all matter. The one variable most manuals skip is... Read more...
Exercise Frequency and Male Fertility: The Recoverable Middle Wins
If you have spent any time reading about sperm counts, you know the news is not great. Sperm concentration has dropped in many countries over the past several decades. That context makes the exercise question feel urgent. How much should you train if you are trying to conceive? The research points toward an inverted U. Men who barely move and men who grind themselves into the ground both tend to show lower sperm parameters than men doing consistent, recoverable work.The clearest number I found comes from a 2015 study in... Read more...
Natural Semen Volume Supplements Are Repackaging an Ancient Anxiety
Walk down the men's health aisle and you'll see a row of bottles that all promise the same visible result: a bigger load. The wording changes from brand to brand, but the pitch doesn't. More volume equals more virility. That idea is older than the capsule, older than the label, older than the supplement industry itself.The reason these products sell isn't complicated. Most men buying them aren't measuring fertility. They're measuring a visible output and treating it like a scoreboard. That scoreboard is the weak link in the whole category.The... Read more...
Sperm Banking Options and Prices: The Customer Changed, the Bill Didn't
In 1953, researchers at the University of Iowa reported the first human birth using sperm that had been frozen in dry ice at -79 degrees Celsius, thawed, and used for insemination. Four years earlier, a British team had figured out that glycerol kept sperm alive through freezing. Those two discoveries built the entire sperm banking industry, and today's sperm banking options and prices still run on that same protocol.What shifted in the decades since isn't the science. It's the customer. Sperm banking used to be a narrow medical service for... Read more...
A 7-Day Fertility Diet for Men Built on Walnuts, Fish, and Cooked Tomatoes
In January 2020, JAMA published the largest placebo-controlled trial ever run on zinc and folic acid for male fertility. Researchers gave 2,370 couples either daily folic acid and zinc or a placebo for six months. The supplement group showed no improvement in semen quality and no increase in live births. The trial, called FAZST, is not exactly famous, but it should be (Schisterman et al., JAMA, 2020).I spent a chunk of this year reading the male fertility nutrition research because someone close to me is trying to conceive. The pattern... Read more...
Sauna Ambient Lighting Works Best Warm, Dim, and Below the Bench
The first Finnish smoke saunas had no windows, no chimney, and no light switch. The only glow came from the fire beneath the stones and a small oil lamp by the door. Men sat in near darkness for an hour or more while the heat pushed their heart rates up toward what you'd expect from a brisk walk. The modern version of that room is often sold as a lighting showcase. Color-changing LED strips, fiber-optic star ceilings, chromotherapy panels. Some of it photographs well. Very little of it accounts for... Read more...