"Do I Love You?" is a 1939 popular song written by Cole Porter, for his musical DuBarry Was a Lady, where it was introduced by Ronald Graham and Ethel Merman. A different song by the same name - written by Phil Spector, Vini Poncia, and Peter Andreoli a.k.a. Peter Anders - was a hit record for the Ronettes in 1964.
Notable recordings
Larry Hovis, who played Carter on Hogan's Heroes also recorded this as a solo single around 1958. https://web.archive.org/web/20080820064800/http://www.larryhovis.net/mp3.php
References
Do I Love You? Wikipedia(Text) CC BY-SA