By turning people in on themselves and their own interests, the focus on practicality essentially objectifies both parties in the relationship. Consider the analogy some give for cohabitation: just as one would test-drive a car before buying it, one should live (and sleep) with another person before deciding to marry. What, exactly, are people imagining when they think this? Do they really think they can test-drive a person by living with him or her for however many months or years? Only if they view other people as objects to be used and marriage as a material investment that will likely lose value over time."
Auguste Meyrat, How Cohabitation Traps People Into Using Each Other