Rod Stewart's Tonight's The Night (Gonna Be Alright) is second in the Billboard list.
Boyz II Men's ballad I'll Make Love To You, Next's Too Close and Marvin Gaye's Let's Get It On round up the top five.
Billboard's list is based on the popularity of songs from 1958 until early January of this year.
It's not until No 10 -- which is taken by Rod's Da Ya Think I'm Sexy? -- that sex is mentioned in any song title.
Crooner Barry White didn't even make the list, while Marvin's Sexual Healing is No 35.
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