One of the headline stories at the Winter Olympics was that the Village where the athletes were staying, ran out of condoms!
For decades, the idea that sex before competition ruins performance has been treated like sacred locker-room wisdom. Entire teams have been benched from bedroom activity before big matches, and legends like Muhammad Ali were famously said to abstain for weeks before a fight. Coaches have repeated the rule so often you’d think it was printed somewhere between the Ten Commandments and the offside rule.
And yet… not everyone got the memo. Brazilian football icon Ronaldo Nazário once recommended “passive” sex the night before a game to relax. Meanwhile, Cristiano Ronaldohas openly said it helps him concentrate.
So, who’s right, the celibate camp or the “carry on as normal” crowd?
What the science actually says
Let’s start with the headline-grabber: a study out of Oxford University surveyed 2,000 runners after the London Marathon and found that those who had sex the night before were, on average, five minutes faster. Five minutes! That’s the difference between respectable time and texting everyone you know about it.
Before we all start prescribing romance as a training strategy, other research adds some balance. Exercise physiologist Tommy Boone found no meaningful difference in treadmill performance between men who had sex the night before and those who didn’t.
Similar conclusions have been echoed across multiple small studies: sex the night before doesn’t seem to harm performance.
So far, so reassuring.
The timing matters.
Where things get interesting is timing. Studies from Geneva and Cologne suggest that sex too close to competition, within about two hours, may reduce performance in strength, speed, and combat sports, particularly in men. Athletes in these categories showed decreased output and slower recovery.
The likely culprit? A temporary dip in testosterone and, with it, a slight drop in aggression, not ideal if your sport involves tackling, sprinting, or knocking someone out. No nookie fort he Springboks shortly before the game!
Endurance athletes, however, seem largely unaffected. Marathon runners can relax, in more ways than one.
And what about women?
Here’s where things get even more interesting.
Women may actually get a performance boost. Sexual activity can increase testosterone levels in women and has pain-relieving effects, which could help with muscle soreness or recovery. In other words, what’s been framed as a risk for men might be a quiet advantage for women.
Defining “sex” , because, apparently, we must.
One of the more unintentionally funny aspects of this research is how narrowly “sex” has been defined. Many studies focus on heterosexual, college-aged men and define sex as something that ends when the man does. Not exactly a masterclass in inclusivity, or accuracy.
Researchers have even debated whether “active” versus “passive” roles matter (yes, really),and whether duration plays a part. Most recorded encounters lasted under 10 minutes, which may come as a relief to some readers and a disappointment to others
Where did this myth come from?
Historically, the idea dates back to the belief that ejaculation drains testosterone, and with it, strength and vitality. That theory hasn’t held up under scrutiny.
A 1968 study, one of the first to test the claim, found no difference in strength or endurance between men who had sex and those who abstained. More recent reviews, including a 2016 meta-analysis, have gone further, suggesting there’s simply not enough strong evidence to support the myth at all.
As researcher Gerald Zavorsky puts it: there’s no solid physiological reason to avoid sex before sport. Most people don’t burn enough calories during sex to meaningfully deplete energy stores, unless, perhaps, they’re treating it like an Olympic event.
The real factor: routine
If there’s one thing science does support, it’s consistency. Athletes perform best when they stick to familiar routines. If sex is part of your normal life, skipping it the night before a big event might actually be more disruptive than helpful
On the flip side, introducing something new, whether it’s a romantic adventure, a late night out, or even that “just one glass of wine”, can throw you off.
The psychological wildcard
There’s also a mental angle. Some coaches believed that sexual frustration fuels aggression, the so-called “frustration-aggression hypothesis.” The theory suggests that being deprived might sharpen your competitive edge.
But this raises an important question: do you really want to win because you’re focused… or because you’re annoyed?
As former Olympic runner Marty Liquori once quipped, “Sex makes you happy. Happy people don’t run a 3:47 mile.” Science, however, seems to disagree.
So… should you, or shouldn’t you?
Here’s the bottom line:
Sex the night before competition is unlikely to harm performance
It may even help with relaxation and sleep (thanks, endorphins)
Avoid it too close to competition if you’re in strength or combat sports
For endurance athletes, carry on
For women, it may actually offer a small advantage
In other words, you don’t need to cancel date night just because race day is looming.
In fact, if it helps you sleep, reduces anxiety, and keeps your routine intact, it might be one of the most enjoyable parts of your pre-race preparation.
Just maybe don’t schedule it for 30 minutes before kick-off. Even science has its limits.
