Print this out and take it to the beach this sunny day,

it mentions, amongst other things, the invention of the g-string;

"Thus the women of the Karaib, Aruak, and Tupi tribes in the Xingui region all wear a triangular piece of bark bast not more than 7 centimetres wide and 3 centimetres high. The lower end of the triangle runs" into a perineal strip of hard bark about 4 milli- metres wide. Two narrow cords coming from the two upper ends pass along the groins, and meet the narrow perineal strip coming from the lower end of the triangle. These uluri only just cover the beginning of the pubic cleft, pressing tightly on it. The triangle does not reach the introitus vaginae, which is, however, closed, or at least kept inwards, by the pressure exerted by the tightened strip of bast running from front to back. Similar binders are used by the Indian women of
Central Brazil. The binder used by the Trumai women is twisted into a cord, serving still less as a cover. In fact, none of these binders serve as covers, but they are intended to close up and to protect the mucous membrane."

and even plastic surgery;

"Among some tribes of Indonesia a mutilation is customary, which is most likely intended to intensify the lust of the women. It consists in a perforation of the glans or the body of the male organ, into which a little stick is inserted. These little sticks are called palang, ampallang, utang or kampion, and are replaced on journeys or at work by feather quills. Among some
tribes several little sticks are stuck through the penis. Nieuwenhuis describes this operation as follows : "At first the glans is made bloodless by pressing it between the two arms of a bent strip of bamboo. At each of these arms there are openings at the required position opposite each other, through which a sharp pointed copper pin is pressed after the glans has become less sensitive. Formerly a pointed bamboo chip was used for this purpose. The bamboo clamp is removed, and the pin, fastened by a cord, is kept in the opening until the canal has healed up. Later on the copper pin (utang) is replaced by another one, generally of tin, which is worn constantly. Only during hard work or at exhausting enterprises is the metal pin replaced by
a wooden one." Exceptionally brave men have the privilege, together with the chief, of boring a second canal, crossing the first, into the glans. Distinguished men may, in addition, wear a ring round the penis, which is cut from the scales of the pangolin, and studded
with blunt points. It may hence be concluded that the perforation of the penis is not intended as an endurance test for the young men, but that the pin is introduced for the heightening of sexual excitement."

and the candiru fish gets a mention;

"There are still greater dangers in the wilderness. In Brazil there exists a small fish (Cetopsis candiru) which has a tendency towards boring itself into any of the exposed orifices of the body. It slips into the urethra, and is prevented by its fins from getting out again, and thus
may easily bring about the death of the victim, to whom nothing remains but to attempt an impromptu operation by slitting open the urethra with his knife."

(Hint: Always wear a condom when swimming in the Amazon)

Happy beaching!!!