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.