From Ovid's "Metamorphoses", Book IV:

"I've won, he's mine!" she cried, and flung aside
Her clothes and plunged far out into the pool
And grappled him and, as he struggled, forced
Her kisses, willy-nilly fondled him,
Caressed him; now on one side, now the other
Clung to him as he fought to escape her hold;
And so at last entwined him, like a snake
Seized by the king of birds and borne aloft,
Which, as it hangs, coils round his head and claws
And with its tail entwines his spreading wings;
Or ivy wrapping round tall forest trees;
Or, in the sea, a squid whose whipping arms
Seize and from every side surround their prey.
The youth fought back, denied the nymph her joy;
She strained the more; her clinging body seemed
Fixed fast to his. "Fool, fight me as you will",
She cried, "You'll not escape! Ye gods ordain
No day shall ever dawn to part us twain!"

Her prayer found gods to hear; both bodies merged
In one, both blended in one form and face.
As when the gardener sets a graft and sees
Growth seal the join and both mature together,
Thus, when in fast embrace their limbs were knit,
They two were two no more, nor man, nor woman -
One body then that neither seemed and both.