Their result was as the title implies: most women are bisexual, they also found that women became less certain of their sexuality as they aged.
Professor in Psychology Elizabeth Morgan says that heterosexual women often feel more than ‘just’ friendship for their girlfriends. Previous research did show that 20 percent of women are attracted to other women. This could explain why women tend to have a more physical relationship with each other than men have. Several experts mention that women’s friendships are hardly different from romantic friendships. Morgan: “Women are encouraged to bond emotionally. This could lead to the development of romantic feelings.”
On the other hand, women who, at a younger age, believe to be exclusively attracted to women, tend to change their minds too. For a period of 15 years, psychologist Lisa Diamond followed a group of women who first said to be attracted to the same sex. Her data shows how their sexuality develops over time. At the end of the study she asked them to identify their sexual orientation again, giving them the options ‘lesbian’, ‘bisexual’, ‘heterosexual’ or ‘indeterminate.’
Suprisingly, Diamond discovered that every woman had repeatedly changed her sexual orientation. “The older women get, the more often they define their sexuality as ‘indeterminate’. They feel that their sexuality can’t be confined. We generally think of getting older as becoming more sure of who we are and what we want. In this case, the opposite seems to be true.”
Can't link there as I don't have the required amount of posts yet, but I'm sure you all know how to use google