The goal of the 1994 UN International Conference on Population and Development (ICPD) Program of Action (signed by 179 countries) is to achieve a universal accessibility for the general population towards Reproductive Health (RH) care services. This is done by mainly concentrating on providing the young people a safe, affordable, and effective RH care services as well as promoting the gender perspective . Accordingly, RH care is defined as the constellation of methods, techniques and services that could contribute to the RH among the population by tackling and preventing the RH problems. RH care services also concentrates on providing better sexual health care services to enhance the quality of life and the personal relationships, rather than only consulting and caring for the related reproductive health and treating sexually transmitted diseases (STDs) .
As part of the family planning program in China, RH services and education are mostly conducted in the urban areas under the birth control program targeting only married women. In 2005, the UN Millennium Project report cited "the expanding access to sexual and RH information and services, including family planning" is a necessity . So, from this perspective, new rules and policies in China were put forward that started to emphasize on the equality and rights of each individual to receive health education and public service irrespective of a person's place of residence . Urban population refers to people who have official recognition of their resident status in the urban areas, while a floating or migrant population refers to people whose official recognition of their resident status is not in the specified urban areas, although they live and often work in the urban areas. However, the migrant workers are considered a disadvantaged population in accessing all types of working skills, work settings, social support networks and health services . Studies that were conducted in other countries found that migrants are the most vulnerable group within the society in receiving health care services. This is attributed to the existence of low education among the young migrants, low awareness about HIV and/or sexually transmitted diseases (STDs), and insufficient ability of accessing and utilizing the local basic RH care services to prevent high risk behaviors such as those related to AIDS and STDs [4, 6]. Young migrants are more likely to encounter problems as a result of broad changes in work and living circumstances combined with socioeconomic and cultural shock. These factors may impact their attitude towards marriage and their sexual life [4, 7]. According to 2005 sampling survey performed on 1% of the population, the total number of migrants in China reached to 0.15 billion (accounted as young adults) and 71.1% of migrants are between 15-34 years old, a large proportion of which are unmarried . Furthermore, as for the sexual behavior among migrants, irrespective of gender, the sexual maturity among youth is occurring at an earlier age than it was in the previous decades. Also, the sexual attitude is changing among young people; thus, indicating an increase in the premarital sexual behaviors [9, 10]. In many developing countries, studies were performed on reproductive health conditions among young people, which revealed a broad lack in the necessary knowledge about sex and reproductive health as well as competence and awareness about self-protection [11–14]. Unsafe sexual behaviors have driven unmarried young migrants to expose themselves to many risks such as premarital pregnancies, induced abortion, venereal disease and STD/AIDS [15, 16].
The present and existing RH care services in China are traditionally provided for the married people according to the fertility control policy. As for the unmarried group, the physical and psychological health education is provided only at schools. The unmarried young migrants, as a significant social group, who graduated or dropped out of schools, lack in the basic health education about RH services, and their RH needs are being ignored [17–19]. One study showed that the governmental family-planning workers were ambivalent about the provision of RH services to unmarried young people . Due to the serious situation, the young migrants are facing several sexual behaviors and RH problems-the main concerned issue at the ICPD, requiring more attention from the governmental and non-governmental social sectors [17, 21].
With the support of the international health organizations, some pilot cities in China were chosen to supply several RH services to the unmarried migrants. Since 2003, Marie Stopes international initiated "you and me" RH service centers in Qingdao, Nanjing and Nanning, and expanded to cities in Guangdong province. In general, there are limited studies on the utilization of RH services for the unmarried migrants [17, 22]. From research aspect, some researchers studied the needs of RH services [19, 22], others mainly concentrated on the married migrants [13, 23, 24] and school adolescents , while there are few large scale researches that have addressed any of the above issues.
Since unmarried migrants are a vulnerable group in the urban areas, we assumed that they have very limited autonomy and accessibility to RH services. Hence, to increase our understanding about the unmarried migrants' utilization of urban RH service provision, we have evaluated their knowledge and utilization of RH services. In doing so, our aim is to provide the scientific evidence that can makes us develop an appropriate planning in order to improve RH service provision for the unmarried migrants.