The song "69" is widely interpreted as a reference to the sexual position 69. According to Bryan Adams, the song is about having sex in the summertime.
While the title might initially suggest a nostalgic song about the summer of 1969, as some listeners assume, the lyrics and Adams' explanation suggest a more risqué interpretation. The number "69" is a well-known euphemism, and Adams confirmed this meaning behind his song title.
Therefore, understanding the song title's meaning requires acknowledging the double entendre. While seemingly about a year, it is primarily a sexual innuendo.
