The history of sex
A recent discovery of a 365-million-year-old fossilised fish may not sound sexy but it was deemed as one of the biggest breakthroughs in our understanding of animal's sexual activity.
Examining the belly of the fish revealed that conception occurred inside the female rather than eggs being fertilised and hatched outside of the body.
Therefore sexual intercourse is thousands of years older than we first thought, but are you falling behind? See if you can recall the timeline of sexual development from prehistoric to pornographic!
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