What Motivates Her Desire For A Threesome? These Women Unveil Everything 14 percent of adults (and twice as many single men!) have a threesome, according to an ABC survey. Another 21% have daydreamed about it. But it might take some persuasion to persuade your girlfriend to accept the challenge if having a second player in your bedroom is something you've always wanted. While some women "gift" a threesome for their guy's milestone birthdays (you know, once you've been together for many, many years) or when they start to feel attracted to another woman, everyone has a different reason for wanting to try a threesome for the first time. However, if you want to persuade her to have a trio, consider the following reasons why these seven women decided to add an extra set of legs to their beds: