Although the God and Goddess may see them all as equal, and to be loved fairly and equally, in the usual monogamist thinking I can't help but wonder if this occassionally creates problems.
Human beings tend towards possesiveness in our culture, that is a given.
We were taught to think of one for us, and for nobody else whether it be in the distribution of food or of emotional partners. We are supposed to have two parents, one man, one woman, have our own car, one best friend, ideally one job and of course, one true love. The partnership between a High Priest and a High Priestess is a unique phenomenon. Each person is an equal in leadership of the group, there to support the other and to work together in the decisions of running a coven. Consequently, the partners will have a unique affection for one another and will likely have to spend quite a bit of time together.