New chicas, lots of sex!

“The term X effect describes phenomena seen in nearly every species that it has been tested in whereby males show continuously high sexual performance given the introduction of new receptive females.”

What is X?

Answer: (select the text below to show)

Coolidge. The Coolidge Effect is named after the anecdote about a trip Calvin Coolidge and his wife took to a farm. Read more here.

Question by Mohan KV