After a brief excurse to the historical roots two approaches to this problem are explained.

It has been aeons since It required us to physically excurse from Concilium Orb.

Lawrence also remained fascinated by anality, and in Women in Love (ch. 23, 'Excurse') there is that celebration of the potency of heterosexual anal intercourse where desire would, at the very least, seem to confuse his distinction between anality and sexuality proper:

Pflanzengeographie, nach Alexander von Humboldt's werke ueber die geographische Vertheilhung der Gewächse : mit Anmerkungen, grösseren Beilagen aus andern pflanzengeographischen Schriften und einem Excurse über die bei pflanzengeographischen Floren-Vergleichungen nöthigen Rücksichten