Slightly off topic here, but I would like to give a bit of background to the whole thing -including the widow/orhpan thing.
With regards to marrying more than one woman - it does happen, I'm not denying this BUT Islamically, the men have to treat the women exactly equal - if he gives a ring to one wife, the other wife must receive one too - same value etc. In practise, this is pretty difficult and so polygamy is gradually on the decline in many Islamic countrys (with exceptions of course).
What must also be remembered, is that the practice of polygamy arose in the time of the Prophet (Peace Be Upon Him) whereby there were more women than men and a lot of women, without a husband and children, were struggling financially and literally had no food etc. Remember, these were the times when the man was the source of money and stability for the family (Xenia would freak I'm sure!lol)
Therefore, for a man to take another wife and their children, it was seen as a very special and honoured duty. In Islam, the status of orphans is very important as the Prophet Muhammed (Peace Be Upon him) was an orphan too and so by taking on another woman's child and providing for that child, you are doing a very good thing.
Also, sometimes a man marries a woman and finds she is unable to have children...he loves her so much but he wants children. Rather than leave her, the option is there (with her agreement) to take a second wife (also with this woman's agreement) so that he can have a child.
There are lots of other reasons as well, but I'm not a scholar of Islam so I wouldn't put my point across very clearly...but I hope I've answered some questions about the practice in itself.
I don't agree however, with men claiming for more than one wife in a country where polygamy is not recognised, even if the marriage took place outside of the country. But having said that, I'm sure its such a small number and there are far more bigger benefit cheats on the go out there iyswim?