With sexual orientation getting more relaxed as they got older, many women choose to become lesbians or even become bi-sexual. Most textbooks assume that women's sexual preferences are fixed in their early twenties - the same as men - and rarely change later in life.
Utah psychologist Lisa Diamond, who tracked 100 women for more than ten years, found their sexuality became more fluid with age.
The findings will be presented at the American Psychological Association next month.
Source-ANI