None exists in western culture, matriarchal societies being rare. If one does exist, it may be in the Mosuo language. Although, the Mosuo (or Na) culture tends toward serial monogomy, so even they may not have a word for "male concubine" (a bit of an oxymoron).
A male concubine is often referred to as a "concubinus" in historical contexts, particularly in ancient Rome. In other cultures, terms like "male concubine" or "paramour" may also be used. The concept can vary significantly across different societies and time periods, often reflecting the social and legal status of such individuals.
groom
Fiancé is the male version. Fiancée is the female version.
In English there are no masculine or feminine forms. English uses gender specific nouns for a male or a female. The word concubine is a gender specific noun for a woman; a word for woman who lives with a man but has lower status than his wife or wives. There is no equivalent noun to apply to a male except perhaps a slave.
A "Dingo" is the male version of a cougar woman!
The male version of Gabrielle is spelt Gabriel
The Concubine's Children was created in 1994.
The Magnificent Concubine was created in 1962.
Concubine Qi died in -194.
The Concubine - novel - was created in 1966.
Fragrant Concubine was born in 1734.
Fragrant Concubine died in 1788.