"knock" = "vagina", 1664?

[Joel S. Berson]

I do not see "knock" = "vagina" in OED2.  What does one make of: this
from 1664?

And thus she argues of the case:
My knock doth piteously itch
O prethy Penion set to a stich.
His answer being thus to her
I will not prove false to thee my dear
But as thou didst desire me
Thy groaning hole I'll steech and see
And looking on in strange wise
She wet his nose and pist in 's eyes.

[There's more in this vein.]

The author who quotes this asserts "vagina" in a footnote for "knock".

Joel

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