Human Sexuality Lecture Notes

Introduction

• Lecture discusses the complexities and fascinating intricacies of human sexuality.
• Aim: Explore a range of topics from the science behind sexual arousal to societal norms' impact on sexual behavior.
• Encourages a nuanced understanding of sexuality for fostering healthy relationships and mutual satisfaction.

Pheromones and Ejaculation

• The human nose can detect pheromones, influencing sexual attraction.
• Ejaculation can reach up to 28 mph.
• Pelvic prolapse: Descent of vaginal walls, significant health concern.

Sensitivity and Arousal in Women

• Clitoris: ~8,000 nerve endings, extremely sensitive during arousal.
• Vaginal walls can expand up to 200% of their normal size.
• Multiple orgasms: Clitoral, vaginal, and cervical.
• G-Spot: Area inside the vagina, identified by German gynecologist Ernst Graffenberg.
• Orgasms can alleviate menstrual cramps due to endorphins.

Sexual Physiology and Behavior

• Average erect penis length: 5.1 - 5.7 inches.
• Brain releases oxytocin during sexual activity promoting bonding.
• Testicles produce ~1,500 sperm per second.
• Spontaneous orgasms during exercise are known as exercise-induced orgasms or 'orgasms'.
• Sexual desire in women may peak during ovulation.
• Regions of the brain like the nucleus accumbens activate during sexual arousal.
• Sexual intercourse lasts 5-7 minutes on average excluding foreplay.

Pubic Hair and Testosterone

• Pubic hair acts as a cushion, protecting the genital area from friction and bacteria.
• Clitoral size varies among individuals.
• Both men and women have testosterone, men typically have higher levels.
• Sex flush: Reddening of skin during arousal due to increased blood flow.

Relationship Dynamics

• Watching a partner masturbate can improve sexual experiences.
• Holding hands can synchronize heart rates and breathing patterns.
• Oxytocin released during physical intimacy promotes bonding.
• Regular expressions of gratitude strengthen relationships.
• Dopamine released during romantic attraction.
• Pets can enhance relationship satisfaction.
• Novel activities together increase relationship satisfaction.
• Love has pain-relieving effects.

Challenges and Efforts in Relationships

• Long-term relationships require effort and communication.
• Laughter strengthens emotional bonds.
• Vasopressin linked to long-term commitment.
• Shared attitudes and values promote lasting relationships.
• Vulnerability and kind acts deepen emotional intimacy.
• Physical affection releases oxytocin, fostering security.
• Eye contact during conversation increases intimacy.
• Active listening and validation improve relationship satisfaction.

Societal and Cultural Influences

• Romance in the workplace leads to long-term commitments more often than other meeting scenarios.
• Women value a partner's sense of humor over physical appearance.
• Post-coital relaxation due to prolactin release.
• Shaving or waxing intimate areas can increase stress due to societal beauty standards.
• Foreplay similar to stretching before exercise, prepares for intimacy.
• French cultural attitudes towards sexuality:
  • Higher frequency of sexual activity.
  • Acceptance of oral sex.

Sexual Variations and Health

• Paraphilia: Atypical sexual interests or behaviors (e.g., exhibitionism, voyeurism).
• Gender dysphoria: Distress from a disconnect between assigned gender and gender identity.
• Sexual fluidity: Sexual attractions and desires may change over time.
• BDSM: Bondage, Discipline, Dominance, Submission, Sadism, and Masochism.
• The Coolidge Effect: Renewed sexual interest in males when introduced to new partners.
• Sexuality in older adulthood remains significant.
• Common sexual difficulties can be addressed by consulting a sex therapist.

Sexual Anatomy and Preferences

• Penis girth often considered more important than length for pleasure.
• Vagina’s elasticity prevents permanent changes due to intercourse.
• Maintaining warmth (e.g., wearing socks) can improve sexual satisfaction.

Conclusion

• Insights into human sexuality highlight the complexity of biological, psychological, and sociocultural influences.
• Emphasizes the importance of mutual respect, understanding, and communication in fostering healthy and fulfilling intimate relationships.