Gerald Hiestand convincingly argues that the answer is yes:
Gerald Hiestand, “A Biblical-Theological Approach to Premarital Sexual Ethics: or, What Saint Paul Would Say about ‘Making Out,’” Bulletin of Ecclesial Theology 1 (2014): 13–32.
This article expands on the first two chapters in Gerald Hiestand and Jay Thomas, Sex, Dating, and Relationships: A Fresh Approach (Wheaton: Crossway, 2012).
Here’s the article’s thesis: [Read more…] about Is It Sinful for Unmarried Couples to Make Out?