A Hebrew man, moreover, could rule over more than one woman. So a man and a woman in marriage may have been “one flesh,” but it was more his flesh than hers, and was subject to more flesh being added. The only scriptural limit was that Hebrew men were not to marry non-Hebrew women (Deuteronomy 7:2-8).

Ronald L. Ecker
And Adam Knew Eve: A Dictionary of Sex in the Bible
Hodge & Braddock, 1995