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Humans

Humans were kissing at least 4500 years ago, reveal ancient texts

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

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Electrically stimulating the clitoris could treat low libido in women

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Health

The microbiome inside the penis can be altered by vaginal sex

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A transmission electron micrograph of a colony of Gardnerella vaginalis , bacteria that are found in vaginas and the urethras of men who have vaginal sex
Interracial heterosexual couple holding hands at home. Millennial young love between two different races; Shutterstock ID 1493320925; purchase_order: -; job: -; client: -; other: -

Humans

Impulse review: An authoritative, if dry, sexual behaviours manual

Culture

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Artificial tissue that mimics connective tissue in the penis restored erectile function in pigs with an injured penis

Health

Synthetic tissue restores erections in pigs with penis injuries

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Fruit fly

Life

Male flies produce a chemical that makes females sleep in after mating

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The Amami spiny rat

Life

A rat without a Y chromosome could be a glimpse of our genetic future

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Couple in bed

Health

Vaginal immune activity increases after having sex for the first time

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The mucus in cows' salivary glands may have anti-viral properties

Health

Personal lubricant made from cow mucus may protect against HIV

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Health

Female emission at orgasm confirmed to release fluid from the bladder

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

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Liquid squirting from a grapefruit

Life

Monkeys in Bali use stones as sex toys to fill their leisure time

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Health

Long covid symptoms may include hair loss and ejaculation difficulties

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Life

Lizard can switch from female to male before birth, but not vice versa

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Video

Acoustic camera reveals how calls from male frogs attract females

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