Sex between two males is extremely common in wild macaque monkeys
10 July 2023
Almost three-quarters of male macaques observed by scientists mounted other males, and the behaviour may help to strengthen alliances
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Premium
Humans were kissing at least 4500 years ago, reveal ancient texts
18 May 2023
Many sources claim sexual kissing spread worldwide from South Asia 3500 years ago, but there is evidence it was practised in ancient Mesopotamia and Egypt much earlier than that
The microbiome inside the penis can be altered by vaginal sex
21 March 2023
The penis plays host to a collection of bacteria known as the penile microbiome, and an analysis of urethral swabs has found that men who have vaginal sex can pick up bacteria normally found in the vagina
Synthetic tissue restores erections in pigs with penis injuries
4 January 2023
Researchers have developed artificial tissue that enabled pigs with penis injuries to have an erection. The work may lead to new treatments for erectile dysfunction
Male flies produce a chemical that makes females sleep in after mating
22 December 2022
A “sex peptide” transferred from male to female fruit flies during mating interferes with the female’s biological clock, reducing her chances of mating again
A rat without a Y chromosome could be a glimpse of our genetic future
28 November 2022
Researchers have figured out how the Amami spiny rat lost its Y chromosome, and some believe the same fate may be in store for humans
Vaginal immune activity increases after having sex for the first time
7 November 2022
Levels of immune system proteins in the vagina increase after having vaginal intercourse for the first time, suggesting the body is responding to being exposed to new bacteria
Female emission at orgasm confirmed to release fluid from the bladder
16 September 2022
Some women release a large amount of clear liquid from the urethra at orgasm, a process that is distinct from female ejaculation, which involves the release of a small amount of milky liquid. Now the source of both liquids has been identified
Long covid symptoms may include hair loss and ejaculation difficulties
25 July 2022
A study of 2.4 million health records suggests the World Health Organization's set of 33 long covid symptoms may be too limited
Lizard can switch from female to male before birth, but not vice versa
31 May 2022
Some offspring of the spotted snow skink, a lizard found in Tasmania, are born anatomically male but are genetically female
