Long before people were “swiping right,” “hooking up” or “Netflix and chilling,” Americans had another wonderfully indirect way of describing what happened on a date: baseball.
Someone might get to first base. Another person made it to second. A particularly eventful evening might result in third base — or even a home run.
Everyone supposedly knew what that meant.
Except, as it turns out, they didn't.
The sexual baseball metaphor has been part of American slang for generations, but the precise meaning of each base has never been completely standardized. The definitions have changed with time, place and generation. Still, the basic idea has remained remarkably durable: just as a baseball player progresses from first to second to third before reaching home, romantic partners supposedly progress through increasingly intimate physical encounters.
So how did America's national pastime become a way of talking about sex?
Baseball Was Already a Language Americans Understood
Baseball became deeply embedded in American culture during the 19th and early 20th centuries, and its vocabulary quickly escaped the ballpark.
People could be “off base.” Someone could “strike out.” A person might “step up to the plate,” “throw a curveball,” “play hardball” or “touch base.”
And, importantly, someone attempting something could at least hope to get to first base.
The expression originally didn't have to mean anything romantic. Getting to first base simply represented making the first meaningful bit of progress toward a goal. Baseball provided an almost perfect visual metaphor: first base wasn't victory, but you couldn't score without getting there.
Eventually, young Americans applied the same logic to dating.
When Did the Bases Become Sexual?
The sexual meaning appears to have become especially prevalent in the post-World War II era, although variations of baseball-related romantic language appeared earlier.
One revealing example comes from the 1944 Abbott and Costello comedy Lost in a Harem, in which Bud Abbott tells Lou Costello that he “wouldn't get to first base” with a beautiful woman. By that point, audiences could apparently understand the romantic implication without anyone needing to explain the rules.
By the 1950s and 1960s, the baseball analogy fit particularly well with the euphemistic language surrounding sex.
People talked about “necking,” “petting,” “making out” and eventually “going all the way.” Sex was certainly happening, but polite society often preferred not to describe exactly what was happening.
Baseball supplied the perfect code.
So What Are the Bases?
There has never been an official commissioner of romantic baseball handing down the rules, which explains why people from different generations sometimes give different answers.
However, the traditional version usually goes something like this:
First Base — Kissing
Usually more than a quick peck. First base traditionally means passionate kissing or making out, often including French kissing.
Second Base — Touching Above the Waist
Second base generally involves more intimate touching or fondling, particularly touching the breasts or chest, either over or underneath clothing.
Third Base — Touching Below the Waist
This is where definitions become considerably less consistent. Third base commonly refers to intimate genital touching or manual stimulation. In some versions of the metaphor, oral sex is also considered third base.
Home Plate or a Home Run — Sexual Intercourse
Reaching home traditionally means “going all the way” — penetrative sexual intercourse.
That gives us the classic progression:
Kissing → intimate upper-body touching → genital touching/oral sex → intercourse
Simple enough.
Until you ask ten people what third base means and receive approximately fourteen answers.
Why Nobody Agrees About Third Base
Unlike actual baseball, nobody ever published an official rulebook.
The meanings were transmitted largely through teenage conversations, popular culture and regional slang. Consequently, definitions shifted.
Some people considered oral sex third base. Others considered third base genital touching and placed oral sex somewhere between third and home. Some versions expanded the definition of second base to include considerably more than touching above the waist.
Even contemporary explanations continue to acknowledge that the definitions aren't universal.
In a strange way, that ambiguity may have helped the metaphor survive. The whole purpose was to describe sexual behavior without actually describing sexual behavior.
Saying, “We got to third base,” revealed something while conveniently leaving the details fuzzy.
The Metaphor Was Very Much a Product of Its Time
There is another reason the traditional bases can sound dated today: the original metaphor reflected a very specific heterosexual dating culture.
The classic scenario usually imagined a boy attempting to “advance” while a girl decided how far he would be permitted to go.
Even the vocabulary made intimacy sound competitive.
A man could “score.”
He could “strike out.”
He could “get lucky.”
He might boast about how far he “got.”
The woman could consequently be framed less as another participant and more as the playing field upon which the game was taking place.
That attitude reflects some of the complicated sexual expectations of mid-century America, when young men were frequently expected to pursue sexual experience while young women were simultaneously expected to regulate how far encounters progressed.
Modern discussions of sexuality tend to emphasize something the old baseball metaphor largely ignores: mutual consent, communication and pleasure aren't a competition with a finish line.
There also isn't necessarily a natural progression from kissing to touching to intercourse. People can enjoy one form of intimacy without wanting another.
Pop Culture Kept the Bases Alive
Movies, television, music and comedy helped preserve the metaphor long after America's dating culture changed.
Perhaps the most gloriously literal use came in Meat Loaf's 1977 epic “Paradise by the Dashboard Light.”
During the song's famous seduction sequence, baseball announcer Phil Rizzuto delivers increasingly frantic play-by-play commentary as a runner advances around the bases. The baseball game is quite obviously standing in for the physical encounter happening between the young couple.
The joke works precisely because listeners already understand the metaphor.
Countless sitcoms and teen movies have similarly used phrases such as “first base,” “second base,” “third base,” “scored” and “struck out” as convenient shorthand for sexual experience.
For generations of viewers, nobody needed to explain what game was actually being played.
Do People Still Use the Bases?
Yes — although perhaps more nostalgically and jokingly than they once did.
Modern dating has developed an enormous vocabulary of its own: “hooking up,” “friends with benefits,” “situationships,” “ghosting,” “talking,” “Netflix and chill” and countless terms born from dating apps and social media.
Yet ask someone what “getting to first base” means and there is a very good chance they'll still answer kissing.
That's remarkable longevity for slang.
The intermediate bases remain considerably fuzzier, but the two ends of the metaphor have proven remarkably resilient: first base means kissing, while a home run means sex.
Everything between them depends on who's keeping score.
Maybe It's Time to Retire the Scoreboard
The baseball metaphor remains a fascinating piece of American slang because it captures something larger than sex. It reflects the era that created it.
Mid-century Americans lived in a culture where sexuality was simultaneously everywhere and rarely discussed explicitly. Baseball offered a playful vocabulary that allowed people — particularly teenagers — to talk about physical intimacy while maintaining a little plausible innocence.
Today, the metaphor can feel charmingly old-fashioned, funny and occasionally problematic. Modern relationships don't necessarily proceed neatly from first to second to third, and intimacy isn't something one person has to “win” from another.
Still, the expressions refuse to disappear.
Nearly a century after Americans began turning baseball terminology into romantic euphemisms, people still get to first base, strike out, score and occasionally hit a home run.
Baseball may no longer be the only game in town.
But apparently, we're still keeping score.
