Lauren Bacall a visit to the National Press Club in Washington, D.C., on February 10, 1945. It was there that Bacall's press agent, chief of publicity at Warner Bros. Charlie Enfield, asked the 20-year-old Bacall to sit on the piano while U.S. Vice President Harry S. Truman played. After "To Have and Have Not", Bacall was seen opposite Charles Boyer in "Confidential Agent" (1945), which was poorly received by critics. By her own estimation, it could have caused considerable damage to her career, had her performance as the mysterious, acid-tongued Vivian Rutledge in Hawks's film noir "The Big Sleep" (1946), co-starring Bogart,
What Love Is Made Of extremely positive about "What Love Is Made Of", describing it as "darker than anything" from "On a Mission", while calling it "slinky". The reviewer went on to commend the "irresistibly pouty" chorus. Pitchfork Media's Katherine St. Asaph commented that, in the song, the singer "sound[ed] completely enthralled, by either her lover or the music" and complimented her voice, noting that it seemed "ten times bigger than before". Jordan Sargent of "Spin" magazine called the track "exuberant" and highlighted Katy's vocal performance, which he deemed "typically fantastic", while the team from pop music website Popjustice gave "What Love Is Made Of"