Quote:He was his adopted son, and she was still considered his daughter in law.
That's the whole point. She isn't considered his daughter-in-law. This marriage in a sense shows us that just because someone claims he's adopted someone, doesn't make any kind of blood relationship, and therefore doesn't prohibit in marriage, as normal bloodlines would.
Quote:The most disturbing part is he wrote a bit in the koran about it
You've been reading too much Voltaire.
Quote:That is why we bring up the issue of the age and number of sexual partners he had, if his was the example, is that what we all should do?
According to the standards of the time, again you must take this into account, which you consistently fail to do, he actually had very few wives, and nothing was considered untoward about any of their ages. In fact if we look at previous prophets, some of them, according to Jewish sources, had 100's of wives. so Prophet Muhammad (pbuh) was a fairly modest man when it came to taking wives. But still a strong and virile man compared with most males today who call themselves men.
Quote:As for wives, why stop at four?
We are commanded to stop at 4, so we do.
Quote:I was asking what the Islamic definition of a concubine is
The Arabic word which is most often translated as concubine literally means "That which the right hand possesses".