Ma Xiaonian is a Chinese physician

Physician

A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments...

 and professor of sexual medicine who pioneered the field of sexual medicine

Medicine

Medicine is the science and art of healing. It encompasses a variety of health care practices evolved to maintain and restore health by the prevention and treatment of illness....

 and sexology

Sexology

Sexology is the scientific study of human sexuality, including human sexual interests, behavior, and function. The term does not generally refer to the non-scientific study of sex, such as political analysis or social criticism....

in China. Ma's research on sexual medicine and Chinese sexuality has profoundly influenced cultural and social values in China since 1980s. His recent sexological work has focused primarily on Chinese female sexuality