This poem from Clark Ashton Smith (CAS) was unpublished in his lifetime, and is not available on The Eldritch Dark, so the complete text follows. The "Puliakamon" to whom the poem is dedicated has not been identified.
Thou art both the yonic altar and the goddess,
And I am thine acolyte,
The bearer of the lingham.
Of all the poems from CAS that I have read so far, this one feels the very most personal, and it seems like an intrusion to even read it. The explicit nature of the first stanza reinforces the idea (introduced by the dedication) that this is indeed based on one of CAS' own experiences, clearly one that involved the very closest physical intimacy.
It's a truly beautiful poem, and one of the more successful uses of blank verse in CAS' poetic canon. But due to the very personal nature of the content, I can well understand that CAS chose not to publish this one in his lifetime.