Homosexuality is clearly condemned in the Bible. In the past, homosexuality was a taboo. . No one dared to admit it even they did. Homosexual activity was seen as a “moral disorder. The Catholic Church believed that marriage could only happen between a man and a woman. The introduction of same sex marriage was not allowed by the Catholicism.
However, in the recent year, Francis, the current pope of the Catholic Church, told people that homosexual person should be treated with respect and love. Although he does not approve the same-sex marriage, he says Catholic Church should not dismiss gay marriage.
As we see that, the conflict of homosexuality between past and now is obvious. homosexuality in the past was nearly banned, but it nowadays is more generally accepted by the public. Some countries, UK,US,etc, have legalized the the -sex marriage, to enable the gays or lesbian couple to enjoy the legal statue.