It doesn't surprise me if the person who has less income and fewer assets wouldn't want a prenup. Or people who believe it shows a lack of full commitment, a wrinkle in their Medieval/Disney love story.
Prenups seem like a good idea for the partner with more assets, which is more often than not a male. Women are much more likely to initiate divorce.
"In a survey of 2,262 adults in heterosexual partnerships over the course of five years, Rosenfeld found that women initiate divorces 69 percent of the time.
On the whole, they also reported less satisfaction with their marriages than men."
https://www.washingtonpost.com/news/soloish/wp/2015/08/27/wh...