A distinction must be made between tendency and act. Having a tendency or predisposition to behave in a certain way does not justify giving expression to it. The same principle applies to hetrosexual sex.
Homosexual sex can never be procreative.
Sex which divorces the loving, affirmative aspect from the procreative aspect converts such intercourse into an end in itself. Celibacy, for instance, calls both homosexuals and heterosexuals to a life of chastity. Not having sex does not lead to an inferior quality of life. One of the characteristics of the emergence of 'gay culture' has been the encouragement of the high level of promiscuity which, for various reasons, is a feature of male homosexuality the world over. In Denmark a form of homosexual marriage has been legalised since 1989.