An attraction or affinity that is strong but not sexual: The fishing industry is well aware of the love affair anglers have with records(1970s+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with love affair
An intimate sexual relationship, as in They had a torrid love affair many years ago. This expression dates from about 1600, when it referred merely to the experiences connected with being in love. The current sense dates from the second half of the 1800s.
A strong enthusiasm, as in We can't ignore America's love affair with the automobile.