Lesbian, also known as lily, lace, and so on, refers to the female individual whose gender identity is female, but significantly and lastingly attracted to women in emotional, romantic, and sexual aspects, as to seek female sexual activities for sexual satisfaction[1, 2]. As a type of marginalized sexual minority group, female sexual minorities are less and tend to hide[3, 4], resulting in difficulties to find them. For instance, a survey on adult sexual orientation conducted in the United States showed that lesbians and bisexual women accounted for 1.3% and 2.4% of all surveyed women, respectively[4]. A study conducted in Australia on the sexual orientation of women aged 14 and above showed, 1.1% of the individuals identified themselves as homosexual and 1.4% as bisexual[3]. Still, among the women aged 15 to 24, 2.7% were lesbians and 7.4% were bisexual[5]in a cross-sectional survey conducted in Shanghai, China. China, as a traditional developing country, people here have poor acceptance of homosexuals, which leads to the concealment of lesbian identity and marginalization of society[6, 7]. It has been reported that about 1/3 of HIV new cases are homosexual men[8], and due to the higher HIV infection rate[9, 10], men who have sex with men (MSM) are focused by more and more research, while less attention has been paid to lesbians. However, besides the same stress from traditional marriage and family outlook as MSM, lesbians are more likely to have a crisis on low self-identity because of their unique sensitivity and social pressure[11]. At the same time, lesbians also suffer from many psychological and behavioral problems[12, 13], such as anxiety, depression, high-risk sexual behavior, and substance abuse, which greatly threaten their physical and mental health and the quality of life. China's lesbian organizations are still very weak and lack of relevant resources[11, 14], which makes it difficult to provide effective, convenient, and fast protection for female sexual minorities. Last but not least, lesbians and bisexuals as a sexual minority group that deserves special attention.
Compared with heterosexual women, lesbians have a greater likelihood(OR=2.4, 95%CI=2.0-2.9) of suffering from depressive symptoms[12]. Depressive symptoms is close associated with physical and mental health, such as peptic ulcer, high blood pressure, type 2 diabetes, hyperthyroidism, hypothyroidism, and decline of immune function[15]. What’s more, those people with long-lasting depressive symptoms are more likely to have suicidal ideation[16] and high-risk sexual behaviors[17], which give rise to the heavy social burden and the spread of sexually transmitted diseases. Therefore, it is vital to explore the influence factors of depressive symptoms among female sexual minorities.
Studies have confirmed that early life experiences have an impact on health throughout the life course[18, 19]. ACEs are identified as traumatic events, including all types of abuse, neglect and violence that occur to minors who are under the age of 18[20]. ACEs can bring about the increasing risk of poor health outcomes, e.g. substance abuse[18], poor physical health-related indices[20], socially unacceptable behaviors[20, 21], anxiety [22], especially the symptoms of depression[23, 24]. Studies abroad have showed a close correlation between ACEs and mental health, especially depressive symptoms among general population[25, 26],and the whole sexual minorities[27]. However, few studies on the relationship between ACEs and depressive symptoms directly focused on female sexual minorities, especially in China. Therefore, this present study aims to investigate the prevalence of ACEs and depressive symptoms and to explore the relationship between them among female sexual minorities in China.