While it is tecnically legal, there are currently no international same-sex marriage agencies in existence as of 2013.
Also, you should know that the phenomenon of "mail-order brides" no longer exists, since the current US Immigration Laws require that the American citizen prove that he or she physically met the foreign spouse before applying for a fiancé(e) visa. The days of obtaining a fiancé(e) visa for a foreign stranger who agrees to marry you upon arrival in the US are over. Since this eliminates foreign fiancé(e)s who would otherwise not be eligible for a visa to enter the country, the mail-order bride business has collapsed and no longer exists as such.
I don't think you can. You either has to be single or married to adopt. Just living together is neither. if you are in a samesex relationship and has gone through partnership might be possible though.
Anyone can do anything they want to as long as they truly want it. No, in Islam having a boyfriend/girlfriend type of relationship is not allowed whether your a male or a female and whether the bf/gf is Muslim or not. If you have anymore questions regarding the matter, just ask and I'll be happy to answer them. i gree in islam having a boyfrnd or a grlfrnd is not allowd but today no youngr generation follows it .....so if a muslim girl personlly like a non muslim boy...then it is not allowd in islam.....u cannot marry him unless he accpts islam...:)