一个女人的内心
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Video Transcription
The female breast enlarges dramatically during sexual intercourse, increasing its size by up to 25%.
Blood is pumped into erectile tissues faster than it can be pumped away.
The nipples swell and become extra sensitive, increasing in height by as much as 1 cm.
The penis also becomes swollen and stiffly erect, doubling its normal length in the process.
The erect penis is a marvel of fluid mechanics.
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andyt29
a marvel of fluid dynamics. talk about an understatement
回答
至 SevereSept : its called 'the human animal' it was on bbc, by desmond morris, dirty bastard
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