"Birthday Sex" is the debut single by American singer Jeremih. It is the lead single from his debut studio album, Jeremih (2009). The song was written by Jeremih and Keith James and produced by Mick Schultz. "Birthday Sex" peaked at number four on the Billboard Hot 100 and topped the Hot R&B/Hip-Hop Songs chart. The single has been certified 2x Platinum.

Jeremih wrote and recorded "Birthday Sex" in September 2008, initially calling it "Birthday Text" but later revising the name. Initially, a song entitled "My Ride" was scheduled to be released as the first single. Jeremih credited deejay Bam of Chicago's Power 92 for selecting "Birthday Sex" for radio play. The song is based on his own birthday experience. He thought that "someone would've written a song like that already—one that caters to females on their day". Meanwhile, during his first international press interview, Jeremih told noted UK R&B writer Pete Lewis of 'Blues & Soul': "I do think the lyrical concept really did help the song out! To where I feel it's gonna be a timeless record that'll still be played YEARS from now – simply because it's become a new birthday anthem!"

The official remix, "Birthday Sex (iSouth Remix)", features Pitbull, Trey Songz, Teairra Mari, Stat Quo, and Ludacris. The track was arranged by the record production duo iSouth Entertainment consisting of JB and Drunk D.

The music video for "Birthday Sex" was filmed in Los Angeles, California, and was directed by Paul Hunter. In the video, Jeremih is shown with his love interest, Brazilian model Alessandra Cardoso with a Handycam to capture their intimate moments. He proceeds to feed her fruit and desserts while she is blindfolded.

The music video managed to appear at number 3 on BET's Notarized: Top 100 Videos of 2009 countdown.

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