Years ago I dated this average-but-pretty woman, and I slowly introduced her to sex-positive culture and sex parties. When we first started dating she presented a fairly average relationship and sex history. Over the course of a month or two I got her to go to a sex party with me and then eventually got her to swap partners. That was hard for her at first, and about half of women I've gotten to do this find it very hard, while about half are pretty curious to try it out (contrary to some of the manosphere descriptions). She did do it and over time she became more sex-positive. In her rhetoric and actions she began to favor of group sex and consensual non-monogamy.