How physical closeness and sex affect hormones and your health
Cuddling, physical contact, intimacy, and sex don’t just feel wonderful—they also set a lot of things in motion within the body. Intimacy can soothe, connect,...
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Anne Alexander
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Cuddling, physical contact, intimacy, and sex don’t just feel wonderful—they also set a lot of things in motion within the body. Intimacy can soothe, connect, arouse, and relax. This isn’t due to a single “miracle hormone,” but rather to the interplay of hormones, neurotransmitters, the nervous system, and the feeling of being safe and comfortable.
It is important to note that sex and intimacy are not a cure. They are no substitute for medical or psychotherapeutic treatment. However, when experienced voluntarily, pleasantly, and safely, they can promote well-being, relaxation, and body awareness.
What Sex and Intimacy Can Trigger in the Body
When we are touched, cuddle, become sexually aroused, or experience an orgasm, the body reacts on several levels: Your heart rate increases, blood flow changes, and muscles tense and relax. At the same time, various neurotransmitters are activated that are associated with pleasure, bonding, reward, stress relief, and relaxation.
That’s why intimacy and sex can have a calming effect for some people, make pain feel less intense for a short time, or help relieve stress. However, this varies from person to person. Sleep, stress levels, relationships, health, menstrual cycles, medications, and personal experiences all play a major role.
Important to understand
Instead of claiming that sex “cures” or “measurably strengthens your immune system,” it is the medically more accurate classification In short: Intimacy, physical contact, and sexuality can have a positive effect on you through relaxation, bonding, stress relief, and a sense of well-being. If you experience severe anxiety, recurring pain, sexual problems, or stressful changes, you should seek medical or therapeutic advice.
Which hormones play a role in sex and physical intimacy
The following table shows you the most important hormones and neurotransmitters that can play a role in cuddling, arousal, orgasm, and relaxation. This overview has been intentionally simplified—in the body, these processes are interconnected and do not unfold in the same way for everyone.
| Hormone / Neurotransmitter | When will the dividends be paid out? | Possible effect | Important to understand |
|---|---|---|---|
| Oxytocin | During physical contact, hugs, cuddling, sexual arousal, and orgasm. | Can promote a sense of closeness, trust, connection, and relaxation. | Oxytocin is often called the “cuddle hormone.” However, it does not automatically have a positive effect—what matters is whether closeness is experienced as safe and pleasant. |
| Dopamine | In anticipation, desire, sexual arousal, and pleasurable sensations. | Can increase desire, motivation, and the feeling of reward. | Dopamine alone does not explain sexual desire. Libido arises from a combination of physical factors, psychological factors, relationships, stress levels, and hormonal interactions. |
| Endorphins | During intense, pleasurable experiences—such as sex, exercise, laughter, or a massage. | They can promote well-being and temporarily affect the perception of pain. | Pain relief varies from person to person. For some people, sex or orgasm can actually trigger or intensify pain. |
| Adrenaline / Norepinephrine | During arousal, excitement, physical activity, and intense stimuli. | May increase heart rate, alertness, attention, and physical tension. | Heart palpitations, a feeling of warmth, or sweating can be normal when you’re excited. If you experience chest pain or have cardiovascular disease, you should seek medical advice. |
| Serotonin | Serotonin isn’t just active during sex; it’s also generally important for mood, sleep, appetite, and sexual function. | It may be related to inner peace, mood, contentment, and sleep. | More serotonin doesn’t automatically mean more desire. Depending on the situation, serotonin can actually dampen sexual arousal. |
| Prolactin | It can increase after orgasm and also plays an important role during breastfeeding. | It can be associated with relaxation, a feeling of fullness, and the sense that “that’s enough.” | Persistently elevated prolactin levels can affect the menstrual cycle, libido, and fertility and should be evaluated by a doctor. |
| Estrogens & Testosterone | They aren’t simply “released during sex,” but rather shape the body through the menstrual cycle and overall hormonal balance. | They can help influence desire, arousal, lubrication, sensitivity, and energy. | Libido doesn’t depend on just one hormone. Sleep, stress, relationships, medications, the phase of the menstrual cycle, and overall health also play a role. |
| Dehydroepiandrosterone / Dehydroepiandrosterone sulfate | DHEA is produced primarily in the adrenal glands and is a precursor to sex hormones. | May be related to energy, mood, and sexual function. | DHEA is not a “superhormone.” DHEA supplements should not be taken without a doctor’s guidance. |
What you can take away from this
Intimacy and sex can be good for you—but not because they “fix” your body. Rather, they can help you connect with yourself and another person. This can be soothing, bring joy, relieve tension, or simply create a pleasant physical sensation.
- When closeness is pleasant and voluntary, it can contribute to your well-being.
- If you’re feeling stressed, insecure, or under pressure, sex can also feel like a burden.
- Your sex drive can vary depending on the phase of your cycle, sleep, stress, your relationship, and your life situation.
- You shouldn’t just “brush off” pain, anxiety, loss of libido, or significant changes—you should take them seriously.
Good to Know: Sex, Your Period, and Trying to Conceive
When trying to conceive, physical intimacy can also be emotionally important: it can relieve pressure, strengthen the bond, and help you become more aware of your own body. However, an orgasm is not necessary for pregnancy. The most important factors are the timing within the cycle, ovulation, and the fertile days.
If you want to better understand your cycle, it can be helpful to track, over the course of several cycles, when you feel energetic, sensitive, full of desire, or in need of rest.
Frequently Asked Questions About Sex, Intimacy, and Hormones
What hormones are released during sex and intimacy?
Oxytocin, dopamine, endorphins, and prolactin, among other substances, can play a role in physical intimacy, sexual arousal, and orgasm. They influence feelings of closeness, desire, reward, relaxation, and well-being. However, the exact effects vary from person to person.
What does oxytocin do when we cuddle or have sex?
Oxytocin is often associated with bonding, trust, and closeness. Levels of oxytocin can rise during hugs, physical touch, sexual arousal, and orgasm. However, oxytocin does not automatically act as a “love hormone.” The key factor is whether the situation is perceived as safe and pleasant.
Can sex boost the immune system?
Sex should not be viewed as an immune booster or a medical preventive measure. Physical intimacy and a fulfilling sex life can indirectly contribute to well-being, for example through relaxation, stress relief, and better sleep. However, many factors are important for the immune system: sleep, nutrition, exercise, stress, illnesses, and lifestyle.
Can orgasms relieve pain?
Endorphins can temporarily affect your perception of pain. Some people find that sexual arousal or an orgasm briefly relieves certain types of pain. For others, sex or an orgasm can actually trigger or intensify pain. If you experience recurring or severe pain, you should see a doctor.
Does sex help with anxiety or stress?
Physical closeness, touch, and sexuality can have a relaxing effect and reduce stress when they are experienced voluntarily, safely, and pleasantly. However, they are not a substitute for treatment for anxiety disorders, depression, or persistent psychological distress.
Bibliography and Sources
- Cleveland Clinic: Oxytocin: What It Is, Function & Effects
- Cleveland Clinic: Endorphins: What They Are and How to Boost Them
- Cleveland Clinic: Dopamine: What It Is, Function & Symptoms
- Cleveland Clinic: Serotonin: What Is It, Function & Levels
- Cleveland Clinic: Prolactin: What It Is, Function & Levels
- Cleveland Clinic: DHEAS Test: What It Is, Procedure, Results
- McBride JA, Carson CC, Coward RM. Prescribing testosterone and DHEA: The role of androgens in women. Cleveland Clinic Journal of Medicine. 2021.
- Carter CS. Oxytocin and love: Myths, metaphors and mysteries. Comprehensive Psychoneuroendocrinology. 2022.
- NCCIH: Stress
- Hambach A et al. The impact of sexual activity on idiopathic headachesHeadache. 2013.
