Songfacts®:

• "Baby, It's Cold Outside" began life in 1944 as a Frank Loesser song designed to politely tell guests to go home. Loesser and his wife, Lynn Garland, debuted it at their housewarming party at New York's Navarro Hotel, where the song functioned as a kind of musical broom: catchy, charming, and considerably more civilized than shouting "Right, out you go." Guests were expected to get the hint.
• The tune proved so popular that Loesser kept it in rotation at Hollywood parties for years before eventually selling it to MGM in 1948. The studio promptly installed it in the 1949 romantic comedy Neptune's Daughter, where it won the 1950 Academy Award for Best Original Song. Not bad for a tune originally intended to clear a living room.
• By 1949, "Baby, It's Cold Outside" was everywhere, released in eight commercial recordings in a single year. Several became hits, most notably the version by Margaret Whiting and Johnny Mercer, confirming that audiences quite liked a song built around flirtation, snow, and delayed departures.
• Dean Martin first entered the picture in June 1949 when he sang the duet with actress Marilyn Maxwell on The Martin and Lewis Show. That radio performance resurfaced on compilations such as The Very Best of Dean Martin and Relax, It's Dean Martin, Vol. 2, quietly foreshadowing his long association with the song.
• Martin's definitive studio version was recorded at Capitol Studios in Hollywood in August 1959. Produced by Lee Gillette, with orchestral arrangements by Marty Paich (and the album orchestra conducted by Gus Levene), the track paired Martin not with a single female vocalist but with a female chorus, giving the exchange a smooth, lounge-friendly glow. Martin released it on November 16, 1959, as part of A Winter Romance, his only Christmas-themed album for Capitol Records before he decamped to Reprise, where he later released The Dean Martin Christmas Album in 1966.
• Martin's "Baby, It's Cold Outside" refused to behave like a nostalgia piece and staged several comebacks. A posthumous duet with Martina McBride, released in 2006 on Christmas with Dino, reached #7 on US Adult Contemporary and #36 on US Country Airplay.
  
  Then came December 2018, when controversy over the lyrics during the #MeToo movement led some radio stations to ban it. The public response was swift and contrary: sales and streaming surged, proving once again that nothing boosts a Christmas song quite like telling people they're not allowed to hear it.
  
  By the mid-2020s, it had settled into a familiar seasonal routine, reappearing every December in the Hot 100 Top 40 like an old guest who insists on staying just a little longer.