Sexual behavior frequency and biphasic ovulatory type menstrual cycles

Area of Science:

• Reproductive Health
• Human Physiology
• Behavioral Science

Background:

• Menstrual cycle regularity is crucial for reproductive health.
• Understanding the influence of sexual behavior on menstrual cyclicity is important for women's health.
• Basal body temperature (BBT) tracking is a method used to identify fertile periods.

Purpose of the Study:

• To investigate the association between different types of sexual behavior and menstrual cycle characteristics.
• To determine the relationship between sexual activity patterns and basal body temperature (BBT) rhythms indicative of fertility.

Main Methods:

• Prospective recording of menstrual cycles and sexual behavior over 14 weeks in college students.
• Monitoring basal body temperatures (BBT) to assess ovulatory patterns.
• Categorizing sexual behaviors into regular weekly heterosexual activity, sporadic activity, and celibacy.

Main Results:

• Regular weekly heterosexual activity was associated with a mean cycle length of 29.5 days.
• Less frequent sexual activity and celibacy were linked to increased incidence of irregular (short or long) menstrual cycles.
• Women engaging in regular weekly coitus exhibited a 90% incidence of fertile-type BBT rhythms, compared to 55% for sporadically active women and 44% for celibate women.
• Both coitus and male genital stimulation were adequate associates of regular cycles, while masturbation was not.

Conclusions:

• Regular, weekly heterosexual intercourse is associated with the most consistent menstrual cycles and fertile basal body temperature (BBT) patterns in young women.
• Sporadic sexual activity and celibacy are linked to greater menstrual cycle variability and a lower likelihood of fertile BBT patterns.
• These findings highlight the potential impact of sexual behavior frequency on reproductive endocrinology and cycle regulation.