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Dr Adam Rutherford @AdamRutherford
, 15 tweets, 7 min read Read on Twitter
Male Australian redback spiders are the ultimate dinner date: upon releasing sperm during mating, the male is eaten by the female in what is known as ‘reproductive cannibalism’ - arguably the least sexy phrase ever.
Happy #InternationalMensDay2018

hyperurl.co/BookofHumans
Female fruitbats of the species Cynopterus sphinx perform oral sex on males *during* penetrative sex, which (counterintuitively) extends the duration of copulation, possibly for mate-guarding purposes. Happy #InternationalMensDay2018
hyperurl.co/BookofHumans
According to the Kinsey Report, 2.7% of male respondents had successfully performed autofellatio. Happy #InternationalMensDay2018

hyperurl.co/BookofHumans
The vast majority of sexual encounters in giraffes 🦒 follow necking, and are male to male and anally penetrative.

Happy #InternationalMensDay2018

hyperurl.co/BookofHumans
There are two male bears in a zoo in Zagreb who perform a daily act of fellatio, whilst humming.

Happy #InternationalMensDay2018

hyperurl.co/BookofHumans
Clownfish are sequential hermaphrodites, with a dominant female. When the female is removed, the testes of the largest male will atrophy and he will grow ovaries. Not quite what happens in Finding Nemo.
Happy #InternationalMensDay2018
hyperurl.co/BookofHumans
There is one reported case of a male dolphin 🐬 masturbating by wrapping an electric eel around his penis ⚡️

Happy #InternationalMensDay2018
hyperurl.co/BookofHumans
The flatworm Psuedobiceros hancockanus are hermaphrodites who penis fence to determine who will become the egg bearer. The winner pierced the head of the other with its spiked organ.
Happy #InternationalMensDay2018
hyperurl.co/BookofHumans
There are a lot of ways to be male.

There's only one rule that I know of - God damn it, you've got to be kind.

(All taken from my book, the #BookofHumans)
I can do this all day.
Men of the Marind-Anim people in New Guinea enjoy anal copulation with other men throughout their lives, associated with their belief that semen has magical properties. Taking in semen from anal sex increases their masculinity.
#InternationalMensDay2018

bit.ly/2O1qKO6
Bonobos use sex to settle disputes, but contrary to the popular myth, they are not a violent-free society. There is a male in Stuttgart Zoo who penis was bitten in half by superior females.
#InternationalMensDay2018

bit.ly/2O1qKO6
The male dunnock Prunella modularis pecks at the cloaca of females to remove sperm from previous matings. They have sex up to 100 times a day, though each act takes about 1/10th of a second.
#InternationalMensDay2018
bit.ly/2O1qKO6
In cases where the males do the majority of child-rearing, females often have flamboyant ornamentation, eg pipe-fish, and the Eurasian Dotterel.
#InternationalMensDay2018
bit.ly/2O1qKO6
Small male Galapagos marine iguanas ejaculate via masturbation before mounting a fertile female. Male Cape Ground Squirrels masturbate after copulation.
#InternationalMensDay2018

bit.ly/2O1qKO6
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