Hormonal Influences on Sexual Function

Hormonal Influences on Sexual Function - Hormone Harmony Hijinks

• Estrogens: Drive libido, vaginal lubrication, genital sensation. Deficiency → vaginal atrophy, dyspareunia.
• Androgens (Testosterone): Key for libido in both sexes (♂♀). Ovarian & adrenal source in women. Deficiency → ↓desire, arousal, orgasm.
• Progestogens: Generally inhibitory effect on libido, especially synthetic progestins.
• Prolactin: ↑Hyperprolactinemia → ↓libido, anorgasmia by inhibiting GnRH.
• Thyroid Hormones: Both hypothyroidism & hyperthyroidism can impair sexual function.

⭐ In women, testosterone (produced by ovaries and adrenal glands) is crucial for libido; its decline with age or oophorectomy can significantly impact sexual desire.

• Neurotransmitter Modulation: Hormones influence dopamine (↑excitatory) & serotonin (↓inhibitory) pathways affecting sexual response.

Hormonal Influences on Sexual Function - The Diva's Desire

• Estrogen: Maintains vaginal health (lubrication, elasticity, flow). Deficiency (menopause) → GSM → dyspareunia, ↓ arousal.
• Androgens (Testosterone): Key for libido, arousal, orgasm. Ovarian/adrenal source. Deficiency → HSDD.
• Progesterone: Inhibitory effect on libido (esp. synthetic forms).
• Prolactin: ↑ Prolactin → ↓ libido, anorgasmia (inhibits GnRH).
• Thyroid Hormones: Imbalances (hypo/hyper) impair sexual function.

⭐ Estrogen is vital for maintaining vulvovaginal tissue integrity and physiological response during sexual arousal.

Hormonal Influences on Sexual Function - Libido's Lifeline

• Androgens (Testosterone): Primary driver of libido in women.
  • Sources: Ovaries (50%), adrenal glands (50% via DHEA/DHEAS conversion).
  • Levels ↓ with age, oophorectomy, adrenal insufficiency, hypopituitarism.
  • Testosterone therapy may be considered for postmenopausal Hypoactive Sexual Desire Disorder (HSDD).
• Estrogens: Facilitate lubrication, genital blood flow, tissue integrity, sensation.
  • Deficiency (e.g., menopause) → Genitourinary Syndrome of Menopause (GSM): vaginal atrophy, dryness, dyspareunia, ↓ arousal.
  • Local estrogen therapy is effective for GSM.
• Progesterone: Generally neutral or inhibitory; high doses of synthetic progestins may ↓ libido.
• Prolactin: Hyperprolactinemia → ↓ libido (inhibits GnRH → ↓ estrogen & testosterone).
• Thyroid Hormones: Both hypothyroidism & hyperthyroidism can ↓ libido and sexual function.

⭐ Androgens, particularly testosterone, are the principal hormones influencing libido in women; ovaries and adrenal glands contribute almost equally to circulating testosterone levels.

Hormonal Influences on Sexual Function - The Modulating Medley

• Progesterone: Generally ↓ libido, especially high-dose synthetic progestins (e.g., DMPA).
• Prolactin: ↑ Prolactin (hyperprolactinemia) → ↓ GnRH → ↓ libido, erectile dysfunction, anorgasmia.
  • Causes: Pituitary adenomas, drugs (antipsychotics, metoclopramide).
• Thyroid Hormones:
  • Hypothyroidism: ↓ libido, arousal, orgasm.
  • Hyperthyroidism: Variable; can ↑ or ↓ libido, often with anxiety/fatigue.
• Cortisol: Chronic ↑ cortisol (stress) → ↓ libido.
• DHEA/DHEAS: Adrenal androgens; contribute to libido, particularly in women.

⭐ Hyperprolactinemia is a common reversible endocrine cause of sexual dysfunction, impacting libido and arousal across genders by suppressing GnRH release and gonadal function.

Hormonal Influences on Sexual Function - Decoding Dysfunction

Hormonal balance is key for normal sexual response. Imbalances often manifest as dysfunction.

• Estrogen: Maintains vulvovaginal integrity, lubrication. ↓E₂ → atrophy, dyspareunia.
• Androgens (Testosterone): Primary driver for libido. ↓T → ↓desire, arousal difficulties.
• Prolactin: ↑PRL (Hyperprolactinemia) → ↓libido, anorgasmia (inhibits GnRH).
• Thyroid: Hypo/Hyperthyroidism → can alter libido and sexual function.

⭐ In women, testosterone, primarily from ovaries and adrenals, is crucial for libido; deficiency is linked to HSDD (Hypoactive Sexual Desire Disorder).

High‑Yield Points - ⚡ Biggest Takeaways

• Estrogen maintains vaginal lubrication and elasticity; deficiency causes atrophy and dyspareunia.
• Testosterone is crucial for libido in both sexes; ovarian/adrenal androgens impact female desire.
• Progesterone often has a neutral or inhibitory effect on female libido.
• Hyperprolactinemia suppresses GnRH, leading to ↓libido, arousal, and orgasm.
• Thyroid dysfunction (hypo/hyper) significantly impairs sexual desire and function.
• Menopause (↓estrogen, ↓androgens) often causes ↓libido, arousal, and vaginal dryness.