I'm reading "The Application of Mindfulness of the Sacred Dharma", from the Tibetan Buddhist canon. It's very long, with sustained repetitive sections, like a multi-day hike. I'm close to the last chapter, and have been reading for over a year I think. It's both extremely interesting and boring to me. I was suggested it from a quote where male-homosexuality is considered wrong in Buddhism, though overall it seems like an argument for male-homosexuality. There's a lot of discouragement against men having any attraction in women, and it repeatedly argues in favor of the male sex over female. My favorite relationship so far is between the king of the Yāma heaven, Musulundha, and the king swan of the Yāma heaven, Auspicious Time; both give Dharma talks to the gods there.