What is the Biblical basis against same-sex marriage?

I would like to know the “biblical” evidence that the Bible condemns gay or lesbian marriage. All I read concerning the matter if read thoroughly, pertaining to the entire segment in that part of the Holy Bible statements are actually about rape, slavery and prostitution. If two adult consenting individuals love each other can it be ordained of God? For churches that oppose same-sex marriage, what is the Biblical basis for their position?