Seika Vita

One thing engages all four at once.

Seika works on two nerve centres at the same moment — your clitoris and your G-spot. Together they produce a stronger response than either does alone, something brain imaging has documented. ^{[16, 17, 19, 20]}

This isn't a "sex thing." It's physiology.

Four hormones, released within seconds

• Oxytocin — rises sharply during orgasm, and is associated with lower cortisol. ^{[10, 12, 13, 14]}
• Endorphins — your body's own painkillers. ^[23]
• Dopamine — the chemical that declines quietly through perimenopause. ^{[25, 31]}
• Serotonin — quiets the mind, and is linked to falling asleep faster. ^[26]

You can't get this from a supplement, an app, or a routine. Your body makes these four itself — and orgasm releases them together. ^{[10, 14, 23]}

In a study of 778 adults, women who reached orgasm on their own reported the best sleep of any group — better than women who orgasmed with a partner. ^[26]

"Combined clitoral and G-spot stimulation activates two distinct nerve pathways — engaging more brain regions than either alone." — based on Komisaruk fMRI research at Rutgers ^[17]

→ And it matters even more for women in midlife. Here's why.

Menopause is exactly why this works.

After 45, two things happen at once:

• Your stress response gets sharper. Same stressor, bigger cortisol spike, slower recovery. ^{[2, 27, 29]}
• The hormones that buffer stress drop. Oestrogen falls. Progesterone goes earlier and harder. The biological brake between stress and your nervous system weakens. ^{[2, 28, 30]}

That's why supplements, meditation and even HRT only go so far. HRT replaces oestrogen — it doesn't trigger an oxytocin release. Orgasm does, every time. ^{[10, 12, 13, 15]}

If you've felt flat for years, that isn't your personality. Research links perimenopausal anhedonia to disrupted dopamine signalling ^{[25, 31]} — and every orgasm is a dopamine release. ^[23]

Your body needs the exact hormones this releases, because menopause has been depleting them. Oxytocin. Endorphins. Dopamine. Serotonin. The four your body has been losing — released together. ^{[10, 13, 14, 23]}

You've done everything right. This isn't about discipline. It's biological — and there's one thing that releases all four of the hormones you've been losing.

You're not broken. Your nervous system is waiting for the right signal.

→ Feel it for yourself — in the first 15 minutes.

Scientific sources

Cortisol & HPA-axis

1. [1] Smith SM, Vale WW (2006). Regulation of the hypothalamic-pituitary-adrenocortical stress response. Dialogues in Clinical Neuroscience. PMC4867107
2. [2] Woods NF et al. Cortisol levels during the menopausal transition and early postmenopause: observations from the Seattle Midlife Women's Health Study. PMC2749064
3. [3] Pariante CM, Lightman SL (2008). The HPA axis in major depression: classical theories and new developments. PMC3428505
4. [4] Pascoe MC, Thompson DR, Jenkins ZM, Ski CF (2017). Mindfulness mediates the physiological markers of stress: Systematic review and meta-analysis. Journal of Psychiatric Research, 95:156-178.
5. [5] Vgontzas AN et al. (2001). Chronic Insomnia Is Associated with Nyctohemeral Activation of the HPA Axis: Clinical Implications. J Clin Endocrinol Metab, 86(8):3787-3794.
6. [6] Epel ES, McEwen B, Seeman T, et al. (2000). Stress and Body Shape: Stress-Induced Cortisol Secretion Is Consistently Greater Among Women With Central Fat. Psychosomatic Medicine, 62:623-632. PMID 11020091
7. [7] Clow A et al. The cortisol awakening response: more than a measure of HPA axis function.
8. [8] McEwen BS et al. (2016). Stress Effects on Neuronal Structure: Hippocampus, Amygdala, and Prefrontal Cortex. Neuropsychopharmacology, 41(1):3-23. PMC4677120

Oxytocin during orgasm + cortisol antagonism

10. [10] Magon N, Kalra S. Oxytocin: the great facilitator — Systemic oxytocin in human sexual behavior, systematic review. PMC8360917
11. [11] Sexual Medicine (2021). Oxytocin levels in sexual arousal & orgasm.
12. [12] Carmichael MS, Humbert R, Dixen J, Palmisano G, Greenleaf W, Davidson JM (1987). Plasma oxytocin increases in the human sexual response. J Clin Endocrinol Metab, 64(1):27-31. PMID 3782434.
13. [13] Heinrichs M, Baumgartner T, Kirschbaum C, Ehlert U (2003). Social support and oxytocin interact to suppress cortisol and subjective responses to psychosocial stress. Biological Psychiatry, 54:1389-1398. PMID 14675803
14. [14] Jurek B, Neumann ID. Oxytocin: the great facilitator of life. Progress in Neurobiology.
15. [15] Behnia B et al. (2014). Differential effects of intranasal oxytocin on sexual experiences and partner interactions in couples. Hormones and Behavior, 65(3):308-318. PMID 24503174

Dual-stimulation anatomy & mechanism

16. [16] Pfaus JG et al. Clitoral vs vaginal orgasms — the whole versus the sum of some of the parts. PMC5084726
17. [17] Komisaruk BR et al. (2011). Female genital sensory brain mapping (Rutgers fMRI study). J Sex Med
18. [18] Komisaruk BR. Nipple/genital brain regions activation.
19. [19] O'Connell HE et al. Clitoris anatomy + nerve mapping.
20. [20] Buisson O, Foldès P. Clitoris root + anterior vaginal wall relationship.
21. [21] Meston Lab. Vaginal stimulation neurological effects.
22. [22] Boston University Medical. Central mechanisms of sexual function.
23. [23] Komisaruk BR, Beyer-Flores C, Whipple B. The Science of Orgasm. Johns Hopkins University Press.

Orgasm + mental health, sleep

24. [24] Brody S (2010). The Relative Health Benefits of Different Sexual Activities. J Sex Med, 7(4 Pt 1):1336-1361.
25. [26] Lastella M, O'Mullan C, Paterson JL, Reynolds AC (2019). Sex and Sleep: Perceptions of Sex as a Sleep Promoting Behavior in the General Adult Population. Frontiers in Public Health, 7:33. PMC6409294.

Menopause + cortisol + dopamine/anhedonia

25. [25] Soares CN (2017). Depression in the menopause transition: risks in the changing hormone milieu. Women's Midlife Health, 3:8. PMC6214217
26. [27] PubMed (2021). Menopause symptoms + cortisol response.
27. [28] Seattle Midlife Women's Health Study — Cortisol across menopausal transition.
28. [29] SWAN — Study of Women's Health Across the Nation — Vasomotor symptoms research.
29. [30] MacArthur Studies — Cortisol excretion in healthy older adults.
30. [31] Schmidt PJ et al (2015). Effects of Estradiol Withdrawal on Mood in Women With Past Perimenopausal Depression: A Randomized Clinical Trial. JAMA Psychiatry. PMC6391160.
31. [32] Reuter M et al. Oxytocin receptor gene polymorphisms.

These references describe general physiology. Seika is a wellness device, not a medical treatment, and is not intended to diagnose, treat, cure or prevent any condition.