It is the nature and quality of a relationship that matters: one must not judge it by its outward appearance but by its inner worth. Homosexual affection can be as selfless as heterosexual affection, and therefore we cannot see that it is in some way morally worse.
Homosexual affection may of course be an emotion which some find aesthetically disgusting, but one cannot base Christian morality on a capacity for such disgust. Neither are we happy with the thought that all homosexual behaviour is sinful: motive and circumstances degrade or ennoble any act...
We see no reason why the physical nature of a sexual act should be the criterion by which the question whether or not it is moral should be decided. An act which (for example) expresses true affection between two individuals and gives pleasure to them both, does not seem to us to be sinful by reason alone of the fact that it is homosexual. The same criteria seem to us to apply whether a relationship is heterosexual or homosexual.
Towards a Quaker view of sex, 1963