Romans 1:26-29 (NKJV)
26 For this reason God gave them up to vile passions. For even their women exchanged the natural use for what is against nature. 27 Likewise also the men, leaving the natural use of the woman, burned in their lust for one another, men with men committing what is shameful, and receiving in themselves the penalty of their error which was due. 28 And even as they did not like to retain God in their knowledge, God gave them over to a debased mind, to do those things which are not fitting; 29 being filled with all unrighteousness, sexual immorality, wickedness...
The following is from Renew America:
Why homosexuality is wrong By Clenard Childress
The 21st century has offered new challenges to the faith community and society. We are faced with social issues which have become increasingly more complex due to ever shifting perceptions of behavior and relationships. In 1954, Dr. Martin Luther King, in his sermon, "Rediscovering Lost Values," warned the country of a disturbing trend he perceived among its citizens — Moral Relativism. In the 60s it came under this guise: "If it feels good, do it! If it doesn't, do it anyway..." In the 70s it was, "I'm Okay. You're Okay." And these days our children are inculcated with, "I Am Loveable and Kind!" Moreover, they are told it matters if more you feel good about yourself and your choices than what is right. Right and wrong is being educated out of our children leaving them in a disconnected region of clearly undefined blurry grays. With great prophetical insight Dr. King believed that if Moral Relativism was not dealt with, we might lose the nation he had come to love. That was 57 years ago.
The book in the Bible most reflecting this trend of Moral Relativism would be the Book of Judges, for it succinctly relates a season in the history of Israel where "Everyone did what was right in their own eyes." To say something is wrong implies there is a standard or a moral code of ethics or absolutes superseding an individual's desires. What we have forgotten as a nation, and particularly as African Americans, is what the champion of the Civil Rights Movement related in the above mentioned sermon. His tenants were that the Ten Commandments and the principles of the Scriptures, are right, and to deviate from them will cause havoc if not attended to. If you sow to the wind, you reap the whirlwind... In light of this, any cursory search of the Bible regarding homosexuality reveal it is wrong, not only Biblically, but physiologically, sociologically, and even violates secular Natural Law (biologically).
Read more: http://www.renewamerica.com/columns/childress/110505