Personally, I'm against international adoption (in general) at the moment because it is not particularly ethical; essentially, a large portion of children that are available for international adoption are being sold to wealthy westerners, and I have heard it suggested that this is against their parents will. I believe the correct approach to deal with "unwanted" children in developing nations is to increase the standard of living, and to encourage the use of birth control; whether it is artificial birth control (the pill/condoms) or more natural methods (the rhythm method). I don't necessarily have a problem with homosexual adoption, but with there being a massive shortage of children available for adoption I think we should be able to place them in the "best" environment possible; which could potentially discriminate against people for countless reasons. As an example, you might want to place a baby with a family that most closely matches their ethnic background and, since there are far more black babies than white babies available for adoption, the waiting list for black adoptive parents might be shorter than white parents. Of course, this would not preclude white parents from being given a black baby; after all, any loving parents (including parents of different ethnic backgrounds, or homosexual parents) are better than being a ward of the state.
Marriage is simply "the state of being united in a consensual or contractual relationship recognized by law." For many people, it is a precursor to having and raising children, but for many others it is not. I do not believe that capacity or intent to procreate should influence whether or not a couple is allowed to marry. People who do not want to have children should be allowed to marry, and people who cannot have biological children together should be allowed to marry (including cases of infertility, as well as same-sex couples).
Do you agree that people who don't want to have children should be allowed to marry, and that infertile couples should be allowed to marry? If so, then from a procreative standpoint, what's the difference between an infertile couple and a same-sex couple?