Which 1984 song by Prince is a seductive and controversial exploration of sexuality and spirituality?

The song you're referring to is called "Darling Nikki" and is one of the tracks on Prince's 1984 album "Purple Rain." The lyrics of the song detail Prince's encounter with a sexual vixen named Nikki and his subsequent struggle with his own moral and religious beliefs.

The song's sexual content and references to masturbation caused controversy upon its release, leading to the creation of the Parental Advisory sticker that was placed on albums with explicit content. The track became infamous again in 1985 when Tipper Gore, wife of future Vice President Al Gore, heard her daughter listening to it and went on to co-found the Parents Music Resource Center, which advocated for increased censorship in music.

Despite the controversy, "Darling Nikki" is considered a classic Prince track and remains a popular part of his discography. Its exploration of sexuality and spirituality is a recurring theme in Prince's music, with the artist being known for pushing boundaries and challenging societal norms through his art.