imperfect thing, a little disgusting in its unfinished clumsiness

Hi,
I'm a newcomer, from China, who am reading Lady Chatterley's Lover.
Hi,
Here are some words from the novel Lady Chatterley's Lover(the second paragraph, page 252, chapter 12) by Lawrence (planetebook):
(background:the following is Connie's feeling about the sexual intercourse with Mellors)
Cold and derisive her queer female mind stood apart, and though she lay perfectly still, her impulse was to heave her loins, and throw the man out, escape his ugly grip, and the butting over-riding of his absurd haunches. His body was a foolish, impudent, imperfect thing, a little disgusting in its unfinished clumsiness. For surely a complete evolution would eliminate this performance, this ‘function’.

I feel imperfect means having some drawbacks. But What's the meaning of unfinished clumsiness please? And accordting to the folloing paragraph, I suspect unfinished here means did not reach his orgasm.
Thank you in advance

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imperfect thing, a little disgusting in its unfinished clumsiness