I must say I have not heard of Subdrop. I am familiar with the endorphin high and the necessary after-care to ease a girl back down.
As for what the books describe, I do not remember any cases of depression in a girl after sex.
In fact, I would say it would be just the opposite, more like ecstasy.
And, of course, of all women, only a slave girl may truly belong to a man, only a slave girl can be truly his, in all ways, utterly, totally, completely, his, selflessly, at his mercy, his ecstatic slave, helpless and joyous in the total submission which she is given no choice but to yield.
Hunters of Gor    Book 8    Pages 102 - 103
It was not the freedom of convention I then felt but the freedom of nature, not the freedom to be what I was not, which had been prescribed to me, but the freedom rather to be what I was, which, for complex social and historical reasons, had been long denied to me; it was not the freedom of political prescription, but the freedom of nature, the freedom of a rock to fall, of a plant to grow, of a flower to bloom, the ecstatic freedom to be what one was. And I had cried out and seized the man. I, hooded, knew nothing of him but his maleness. I cried out and yielded to him.
Slave Girl of Gor    Book 11    Page 100
She saw that I still smiled. "No, my Master," she whispered, "I do not mean either merely that he induced in me the spasm submissions of the bond girl, or that he enforced upon me the fullness of the humiliating, ecstatic slave orgasms, so far beyond anything attainable by the free woman, to which any free man may subject the slave in his arms. No, rather I mean something quite different. I mean that I yielded to him as I had never before yielded to any man, save yourself, my Master. As I had yielded to you, so, too, did he make me yield to him."
Guardsman of Gor    Book 16    Page 193
Knowing herself as an owned animal, rightless, one forced to submit, one who must obey in all things, who must yield wholly to the master, holding nothing back, she can be driven to almost excruciatingly ecstatic orgasmic heights, experiencing sensations and raptures, perhaps enforced cruelly upon her, of which the free woman, in her freedom, cannot even begin to dream.
Guardsman of Gor    Book 16    Page 210
