The songs usually chosen by the couple are clean and are an expression of their love for one another. I would not like to hear a song that would be suggestive or lewd. It has some very strong descriptions of his beloved. Most couples have more respect for themselves and the church even when they use their favorite secular love song. And I Believe in Those Love Songs.
Music is music.
We shouldn't put a negative label on a song just because it doesn't talk about Jesus. If it's a love song, then hallelujah use it. God is Love. You shouldn't have to sing Telephone to Glory during the biggest celebration of love that a wedding is. A wedding is a personal time, so it s up to the couple.