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The video begins with the subject's genitals in a non-aroused flaccid state (0:00). As arousal progresses(0:30), the subject's penis becomes erect, the scrotum tightens and the testicles elevate. At the peak of arousal (0:57), orgasm occurs and semen is ejaculated from the penis in a series of rhythmic contractions.
Some trademarks (e.g. Nabisco) and titles of published works (e.g. “Ain't That a Shame”) consist of or contain contractions; these are covered at Wikipedia:Manual of Style/Trademarks and Wikipedia:Manual of Style/Titles, respectively. List of common (and not archaic) English contractions
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Missing letters are replaced by an apostrophe in most multiple-word contractions. Contractions such as aren't should not be used in Wikipedia, except in quoted material; use the full wording (e.g., are not) instead. The contraction o'clock is an exception, as it is standard in all registers of writing.
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Vaginal contractions are caused by both the activity of certain brain regions and the release of the hormone oxytocin. It has been suggested that vaginal contractions during orgasm can increase the chances of pregnancy as they transport sperm up the reproductive tract from the vagina to the oviducts, which decreases the distance it has to travel.
In females, it contributes to clitoral erection [4] and the contractions of orgasm, and closes the vagina. Rhythmic contractions of bulbospongiosus muscles during male orgasm This muscle serves to empty the canal of the urethra , after the bladder has expelled its contents; during the greater part of the act of urination its fibers are relaxed ...