Testosterone is the main hormone most strongly linked to feeling “horny,” because higher levels generally increase sexual desire in both men and women. However, libido comes from a mix of hormones and brain chemicals, not just one.
Key hormones for desire
- Testosterone boosts libido, sexual motivation, and spontaneous arousal in all genders. Low testosterone is often associated with reduced sex drive.
- Estrogen helps increase desire and arousal, especially around ovulation, and supports vaginal lubrication, which can make sex feel better.
- Dopamine is a brain “reward” chemical that drives sexual motivation and anticipation of pleasure.
- Oxytocin (the “love hormone”) is released during intimacy and orgasm, enhancing bonding, pleasure, and feelings of connection, which can make you feel more turned on with a partner.
- Progesterone and prolactin, when high, can actually lower sexual desire in many people.
Why there isn’t just one
Sexual desire is influenced by hormones, mood, stress, relationship factors, medications, and overall health, so no single hormone “flips the switch” for everyone. In many people, feeling horny happens when testosterone and dopamine are relatively higher, estrogen is supportive (especially in people with cycles), and “brakes” like stress, high prolactin, or certain antidepressants are not getting in the way.
