These figures come from surveys, older estimates and popular summaries. They describe particular samples, not rules for every person, country or relationship.
- One adult survey reported an average of four lifetime partners for women and seven for men. Answers depend strongly on age, culture, sampling and how people interpret the question.
- Seventeen is often quoted as an average age for first intercourse in some populations. There is wide variation, and readiness, consent and local law matter more than an average.
- A much-repeated 2011 claim said 84% of women sometimes had sex for a practical or relationship benefit rather than pleasure. Without a clearly documented sample and method, this figure deserves particular caution.
- Some surveys have reported orgasm at every encounter for 75% of men and 29% of women. The result changes with the activity studied, wording, sample and definition of orgasm.
- Erectile difficulties become more common with age, but published estimates vary widely by definition and population. Persistent changes are worth discussing with a clinician.
- Among sexually active teenagers in one survey, 70% of girls and 56% of boys said their first experience was with a steady partner. A partner label does not replace clear consent and protection.
- A figure of 103 sexual encounters per year is often presented as an adult average. Frequency varies enormously and is not a measure of relationship quality.
- Some surveys suggest roughly one in ten married couples sleep separately. Separate sleep can reflect work, health, parenting or a deliberate sleep arrangement-not lack of intimacy.
- Some studies find an association between supportive, stable relationships and better sleep in women. Association does not prove that relationship status itself causes better sleep.
- An older CDC contraceptive-effectiveness table estimated that about 85% of people who can become pregnant would conceive within a year if they used no contraception. Individual fertility varies.