There's another theory of beauty: beauty as excess, beauty as transgression. Sometimes this aesthetics claims a corner on the market for beauty as transcendent, but I won't buy into this monopoly. Beauty is what we make of our limitations, not just our escape from them. Phrased differently, we see beauty when we see the truth of our limitations, see them in a different light, see them in light of the resurrection.
One way of describing Dan Brennan's Sacred Unions, Sacred Passions: Engaging the Mystery of Friendship between Men and Women is to say it locates friendship (specifically cross-sex friendships) within these competing dynamics of beauty. On the first page Brennan writes,
This book makes a simple claim: stories of paired cross-sex friendship love are journeys toward communion with God and our neighbor in the Christian story. In the new creation, men and women are not limited to stark contrasts where we must choose between romantic passion in marriage or inappropriate sex/infidelity. Chaste, but powerfully close friendships between the sexes stir our curiosity and resist formulaic gender roles in marriage, friendship, and society.Beautiful cross-sex relationships, he argues, should not be bounded by the aesthetic ideology of excess. Relational beauty, it turns out, is a matter of balance, not sheerly of orgasm or roses and candy hearts.