Libido (noun)

1. A person's sexual desire or drive.
2. A person's overall desire for sexual activity.

Origin:

1905, from latin libido "desire, lust," from libere "to desire, to please,".

Examples:

1. The medication decreased his libido.
2. Her libido increased after she started exercising regularly.
3. The lack of libido is a common side effect of antidepressants.
4. The therapy helped to increase her libido.
5. The libido is different for everyone and can change over time.