Just how much education do most of you have, anyway? This subject was well covered in a Philosophy class I took (in case you wonder about the name of class, it was called "moral problems")
I shall cite some of thw work of John Corvino, from his book "Same Sex: Debating the Ethics, Science, and Culture of
Homosexuality" (1997). While I already knew much of the things stated beforehand, he manages to defeat virtually any arguement against homosexuality, so I'm partially borrowing it.
For the sake of this arguement, I'm going to assume some things, such as that marriage is a good thing, and that all sex should take place inside the bonds of marriage.
Arguements against Homosexuality
It is "unnatural", therefore wrong
Obviously, there are many meanings, and each must be examined seperately:
It is unusuall/uncommon, thus unnatural, and wrong.
This notion is laughable. There are tons of things that are uncommon... Including becoming a pastor, or knowing many languages (more than two). If they are uncommon, are they then wrong?
Homosexuality isn't practiced by other animals, and is therefore unnatural, and wrong.
Either way you look at this, this doesn't work. First, non-human animals don't do many of the things that humans do, such as cooking food to make it sanitary, or even marry. Second, as has been stated before, there is substantial evidence that there are other animals that partake in homosexuality, thus making the actual claim factually wrong, not just morally irrelevant.
What doesn't come from innate desires is unnatural, and therefore wrong.
For this part, I'll ignore the evidence stating that many homosexual people are "born that way". Instead, I will note things from the opposite way; that innate desires are something to judge whether something is morally right. Many people have an innate desire to kill someone; such is the serial killer, or even many people who have unfairly become the victim of a crime. If innate desires are what to judge rightness by, then shouldn't we make murder legal? After all, when somebody actually "murders" someone (as opposed to accidentially killing them), the murder usually stems from a deep desire to want to kill the victim, be it justified or not.
Sex between two people of the same gender isn't what the purpose of those organs is, therefore it's unnatural, and thus wrong.
The person who says this usually mean that it can't result in procreation. However, this kinda falls through when you realize that virtually all organs can be used for many, many purposes. The best example is the mouth. The most obvious uses for it are eating and breathing, but those are the only two that actually are used for the continuation of the human race. Is it thus wrong to use it for talking, singing, playing an instrument, or inflating a baloon? The thought makes me laugh: somebody stranded on an island with an inflatable raft, who won't inflate it because it's not directly related to continuing the human race.
The same seems to hold true for genitals. People don't have sex solely to make more people; they also have sex for pleasure, expressing love, and celebrating and strengthening a relationship (such as marriage). Thus, if you wish to argue that homosexuality is wrong because it doesn't yield children, make sure you condemn the use of contraceptives, or sterile couples having sex regardless of whether they know of their sterility or not.
Homosexuality is disgusting, which means that it must be unnatural and wrong.
I assume that it disgusting to homosexual people, or else they probably wouldn't do it. But even ignoring that, something being disgusting doesn't mean it's wrong. First of all, different people have different opinions; what one finds disgusting, another doesn't. Second, there are many things that are disgusting, that obviously aren't morally wrong. Cleaning toilets, disposing of garbage, and performing autopsies are disgusting to virtually everyone, yet they aren't morally wrong.
Let's look at the statement again:
It is "unnatural", therefore wrong
It seems that the arguements that fit this category are either morally irrelevant, or simply based on false evidence. Claims like this seem to be more personal opinion than moral judgement. Obviously, we should base our lives more on moral judgements than on other's personal opinions.
I'll post responses to other arguments later...
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Nes digs around in the trash can.
Nes finds a hamburger!
Nes puts the hamburger in his backpack.
Wake up, George Lucas... The Matrix has you...