"I Invented Sex" is a song by American R&B singer Trey Songz, and features Canadian recording artist Drake. Together, they wrote the song alongside Tony Scales and its producer, Los Da Mystro. It was released to urban airplay as the third single from Songz's third studio album Ready on October 13, 2009. The song features a sensual message, accompanied by heavy percussion. "I Invented Sex" received positive reviews, and reached number forty-two on the Billboard Hot 100, and became Songz's first song to top the Hot R&B/Hip-Hop Songs chart. Its official remix features fellow R&B singers Keri Hilson and Usher. The accompanying music video, containing a parental advisory warning, is the follow-up to the "Say Aah" video.

When speaking about the record with MTV News, Songz said, "It's a groove record. It's got that knock at the same time. It's sexy at the same time. Conceptually, it's mind-blowing to tell a woman, 'You gonna think we invented sex when we're done.' That's where I am." The song was recorded at 11th Street Studios in Atlanta, Georgia. The official remix of the song features fellow American R&B singers Usher and Keri Hilson. Another remix features Willie Taylor of R&B group Day26. R&B singer Chris Brown freestyled the song in his first mixtape, In My Zone, with the title "Invented Head."

Ajitpaul Mangat of Tiny Mix Tapes said the song, along with the intro, "Panty Droppa", were "swagga-oozing" and "expertly build the mood with chopped and screwed vocals and exploding percussion, respectively." Drake's closing rap has been described as "Best I Ever Had"-esque. David Jeffries of Allmusic noted the song as a standout track from Ready. Complimenting the wide appeal of song's title, DJBooth said that, "With a high-caliber guest feature and a radio-ready sound, this single should be just the thing to boost the already-substantial sales of Songz' third album."

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