This characteristic of the breathing during
sexual excitement is well recognized; so that in, for instance, the
_Arabian Nights_, it is commonly noted of women when gazing at beautiful
youths whose love they desired, that they ceased breathing.[109] It may be
added that exactly the same tendency to superficial and arrested
respiration takes place whenever there is any intense mental
concentration, as in severe intellectual work.[110]
The arrest of respiration tends to render the blood venous, and thus aids
in stimulating the vasomotor centers, raising the blood-pressure in the
body generally, and especially in the erectile tissues. High
blood-pressure is one of the most marked features of the state of
detumescence. The heart beats are stronger and quicker, the surface
arteries are more visible, the conjunctivae become red. The precise degree
of blood-pressure attained during coitus has been most accurately
ascertained in the dog. In Bechterew's laboratory in St. Petersburg a
manometer was introduced into the central end of the carotid artery of a
bitch; a male dog was then introduced, and during coitus observations were
made on the blood-pressure at the peripheral and central ends of the
artery.
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