"Willy Use a Billy... Boy" is a song recorded by German Eurodance project E-Rotic. It was released in October 1995 as the lead single from their second album, The Power of Sex (1996). The song, written and co-produced by David Brandes and John O'Flynn, is about safe sex, where Billy Boy is a brand of condoms from Germany that is also available in the UK. The single reached number eleven in Germany and it was also a hit in Austria and Finland, where it reached number five. Additionally, it was a top-20 hit in Switzerland.