Tigerscent
From what I've read, Hebrew concubines were wives, wives that were slaves beforehand, but wives none-the-less. They were not unmarried mistresses. The issue was whether their status was slave or free before marriage. Or so I've read. It makes sense, too. Keturah is referred to as both Abraham's wife and Abraham's concubine.
Premarital sex is another issue.
From what I've read, Hebrew concubines were wives, wives that were slaves beforehand, but wives none-the-less. They were not unmarried mistresses. The issue was whether their status was slave or free before marriage. Or so I've read. It makes sense, too. Keturah is referred to as both Abraham's wife and Abraham's concubine.
Premarital sex is another issue.
...I don't believe they all 'married' their concubines --- they were considered 'secondary wives' but they really were 'permanent mistresses' until elevated to the status of 'a wife' ... from what I see ...