Wouldn't it be more correct to say that there is a word which is translated to homosexuality?
The English word homosexuality is a relatively modern term. But the principle of homosexuality is not. The bible usually mentions a phrase that is translated
men having sex with men, rather than use a single word term. primarily because all single word terms that describe homosexuality at the time, were considered "curse words."
It wasn't until Homosexuality was accepted in part of the culture was it necessary to give it a term that was not derogatory in nature. And, if a word is seldomly recorded, it is quickly forgotten to time. So instead of using one single term/curse the bible simply uses the phrase "Men having Sex with Men." Subsequently; The Bible consistently tells us that "Men having sex with men" or what has been shortened in some cases as
Homosexuality is a sin (
Genesis 19:1-13;
Leviticus 18:22;
20:13;
Romans 1:26-27;
1 Corinthians 6:9).
Romans 1:26-27) Are some examples.
If homosexuality simply means sex with someone of the same sex then it isn't clear if this is referring to a straight man having sex with another straight man or if it means two gay men having sex in a committed relationship.
Actually it is because there is absolutely no sanctified setting in which this type of sex is permitted. Unlike sanctified sex with a woman.
To be honest I'm not sure where in the Bible it says what the requirements for marriage are.
Is this a question or statement?
If there is no reason to think it is wrong then we probably shouldn't think it is wrong.
These verses tell us it is wrong. (
Genesis 19:1-13;
Leviticus 18:22;
20:13;
Romans 1:26-27;
1 Corinthians 6:9).
Romans 1:26-27
Nothing tells us it is right.
We are to speak where the bible speaks and remain silent where the bible is silent.
The bible speaks against Homosexuality.
It is silent in giving us a context where the homosexual act is permitted by God.
Yet you speak against what the bible says, and you want to remain silent when you need a command to permit this deed.
There is much compromise in the believers life that has to happen to make this not a sin.
I'll give you my reply to the verse when you tell me what it is.

Tell you what verse is what???
The verse that tells us that man shall leave his parents for a woman, and the two shall become one flesh?
(
Genesis 2:24;
Matthew 19:5;
Ephesians 5:31).
That sex outside of the confines of a sanctified marriage is a sin?
You lucked out on this one because the whole of 1 Corinthians 7 speaks to the reasons and responsibility of marriage.