"Other women had a less political reason for wanting to keep their monthly withdrawal bleeding: Many use it as a way to ascertain whether or not they're pregnant, a method that gynecologists confirm is reliable. (Though, they warn, bleeding is not uncommon during the first trimester of pregnancy.) Those in favor of menstrual suppression—including many feminists—argued that allowing women to choose whether or not they wanted to endure their periods or withdrawal bleeding was a long-awaited step in the right direction, especially since the side effects hardly differ from those of regular oral contraceptives. This group also disliked the idea of equating menstruation with womanhood, which they saw as reductive gender essentialism. A majority of menstruating people seem sympathetic to this side: A 2006 survey on menstrual suppression by the Association of Reproductive Health Professionals found that "few women have an emotional connection to their period," and that only eight percent of women "enjoy their period in some way.""