One of the best books you can read on the subject of Homosexuality from a Christian perspective is "The Bible and Homosexual Practice," by Dr. Robert Gagnon of Pittsburgh Theological Seminary. I found the following videos which provide some of the highlights of that book in lecture format.
The Old Testament
Genesis 1 & 2:
Sodom:
Levitical Prohibition:
David & Jonathan:
The New Testament
The Witness of Jesus:
The Witness of Paul:
Hermeneutical Relevance of the Bible
