Women in Heat

As we all know, females across many species have a period where they are known to be "in heat." Women specifically are more attracted to androstenone (a pheromone), symmetrical and masculine faces, and more attracted to the subject of sex.

Here's where it's funny:

The word for heat, Estrus, comes from a Greek word 'oistrus'
which means Gadfly. Literally, it means 'in a frenzied state' because when the gadflies would buzz around cattle, they would drive the cattle into a frenzied state which resembled the same state they go into when they wanted to mate.

So basically, when scientists refer to a woman in heat, they're comparing them to cows. Ha.
(Thanks to the-vu.com and Oxford Journals for that fun fact)