“Every heart stopped beating,
every breath was held, every eye
was fixed upon that man. He went
to the door on the right and
opened it”.

The definition of libido is the emotional energy of biological desires, especially sexual desire.

Sentence: The ups and downs of a man's sexual function are obvious, whilst a woman's libido is harder to measure.

Another sentence: Effects on sex hormones can cause hirsutism, loss of periods, acne, impotence and decreased libido.