"500 Person Sex" (５００人ＳＥＸ, EC-OPEN-0604) is a sex video released by Japanese adult video production house, Soft on Demand (SOD) on 4th May 2006. It is the largest known sex orgy recorded.

It features 250 couples, described by SOD as students, who enter what looks like a large warehouse, and over the course of two hours, engage in a variety of foreplay, mutual masturbation, and intercourse. All sexual acts are performed in near synchronization with all the other couples.

To commemorate international AIDS awareness day on 1st December 2005, a 67-metre pink condom was made and placed over the Obelisco (obelisk) in Buenos Aires, Argentina.

On 1st December 2003, Benetton in collaboration with ACT UP Paris placed a giant condom (22 metres high and 3.5 wide) on the obelisk in Place de la Concorde in Central Paris.

Manufactured by Church & Dwight Inc., Co., Trojan Magnum XL condoms are 30% larger than standard condoms.

Many birds do not have penises, and mate by touching genital openings -- called a "cloacal kiss". But some species of duck and ostriches do have a penis.

The longest bird penis discovered belongs to the Argentine lake duck (Oxyura vittata), measured at around 42.5cm, an astonishing dimension matches the length of an adult male, and compares to the length of an ostrich penis. If the Argentine lake duck were human, we could boast 5 - 6-foot penises!

Back to whales again! In general, cetaceans have no protruding udders like cows. Whale mammaries are two long and fairly flat organs inclined to each other at a slight angle. Their tips are not far from the umbilicus, and the average dimensions in "resting" Rorqual cows are about 7ft. by 2 ft. 6 in. by 2 1/4 in.

See:

• Largest human penis
• Largest penis in animal kingdom

The wedding ritual has been accompanied, from one society to another, by a wide range of coital activities.

In various countries feudal lords were apparently entitled to deflower the young bride before releasing her to her husband. This "right of the first night" (jus primae noctis), known also in France as jus cunni and in England as marchette, appears to have been established on the historical evidence. Monks sometimes held the right: thus the monks of St. Thiodard enjoyed this right over the inhabitants of Mount Auriol.

See:

• Longest human clitoris
• Longest (animal) clitoris

There is long pubic hair and there is pubic hair that is thick and expansive in the general abdominal area. Walter (of "My Secret Life"), an evident connoisseur in such matters, talks with clear delight of a fine bush of "Scots red" pubic hair - "The bush was long and thick, twisting and curling in masses half-way up to her navel, and it spread about 5 in. up her buttocks, gradually getting shorter there."

It was not realised that sperm were concerned in the process of fertilisation until the nineteenth century. Various names are associated with the discovery - Prevost and Dumas (1824), Peltier (1835), and Dujardin (1837) .

In their book "Nymphomania", Albert Ellis and Edward Sagarin represent the failure in a woman - through physiological rather than psychological reasons - to achieve orgasm as the "most frequent physiological cause of nymphomania" (p. 95). This is a highly contentious subject. Not much work has been done on it, and it is extremely difficult to say what is a physiological, and what a psychological, block to experience of orgasm.