Why is it wrong?

When I spoke to a Christian that does not believe in gay relations, she thinks that it is just un-natural as, we were created to be with someone from the other sex and not the same sex. She said she wouldn't dislike somebody just on the basis of being gay, but she would however feel un comfortable if the topic of 'homosexuals' would be brought up. But she feels she would be judges by the gay community, because of her beliefs and opinions. She doesn't believe in gay relations because she grew up with the fact that it is in fact wrong. Her parents had influenced her decision, but as she grows older she may choose to have more of a tolerance with gay relations, but she doesn't know because of what her family has grown up with, what is wrong and what is right. Her parents would let her chose for she as to what she believes is right and what is wrong, and what is okay and what is not.