https://en.wikipedia.org/wiki/Bésame_Mucho
According to Velázquez herself, she wrote this song even though she had never been kissed yet at the time, and kissing, as she heard, was considered a sin.[2][3
http://www.mexconnect.com/articles/1172-did-you-know-consuelo-velázquez-and-bésame-mucho
Consuelo Velázquez was one of Mexico's best known modern songwriters. She wrote her most famous song – "Bésame mucho" – before her 20th birthday. When asked, years later, whose love had inspired the powerful lyrics, she replied that she had written it before she had ever been kissed, and said that the entire song was a "product of imagination".