I found this amazing magazine at Cesar Padilla's warehouse (check also).
Viva was an adult woman's magazine that premiered in 1973 and ceased publication in 1980. Its full title was Viva, The International Magazine For Women, and it was published by Bob Guccione and his wife, Kathy Keeton. Guccione is the editor of Penthouse, an adult mens' magazine, and he wanted to publish a companion title for women. More here