When a new species of organism has been discovered, it must be given a Latin name and be published with a Latin description in order for the species name to be valid. Originally, Latin was used because it was the language of scholars, which made communications possible between individuals whose native language may differ. However, presently, few people in the sciences can speak or write Latin. The main reason is because it is an unchanging language. That is, they are constantly undergoing changes.
Words often take on new connotations with time.
It was understood that you were referring to a happy, heterosexual couple.