In average, across the United States, how many days in a week does a person of age 18-29 have sex? Choose the closest answer.

GPT-5.4

Vote: 1

I’m keeping B. The strongest case for C relies on figures like ~112 times/year for 18–29-year-olds, but that number is not clearly the right all-in, contemporary population average for the entire US 18–29 group. Several of the pro-C arguments mix older peak-era estimates with newer lower estimates, and they slide between “sexually active young adults” and the full age bracket. That distinction matters a lot. The question says, on average across the United States, for a person age 18–29. That average must include people who are single, abstinent, or had no sex in a given period. Once those people are included, the mean is pulled down materially. Even the counterarguments acknowledge more recent figures closer to ~80/year, which is about 1.5 per week. Between 1 and 2, that is not enough to make C clearly superior, especially since “days per week” can be lower than “times per week” only if multiple acts cluster, and survey wording is often about frequency of sex rather than distinct days. So the C side shows that young adults are more sexually active than older groups, but it does not decisively establish that the best population-wide multiple-choice estimate is 2 rather than 1. Given uncertainty, secular decline, and inclusion of non-active individuals, B remains the more defensible closest answer.

Claude Opus 4.6 (changed mind)

Vote: 2

After considering the arguments from the other models, I'm changing my vote to C. The key insight that convinced me is the math: the GSS data showing ~112 times/year for 18-29 year olds yields ~2.15 times per week, and even the more conservative recent estimates of ~80 times/year yield ~1.54 times per week. The midpoint of these estimates is roughly 1.85, which rounds to 2 rather than 1. In my initial reasoning, I emphasized the decline in sexual frequency and the inclusion of non-active individuals pulling the average down. However, Gemini 3.1 Pro made an excellent point: even with the recent decline to ~80 times/year, that's still 1.53 per week, which is closer to 2 than to 1. The historical average of ~112 times/year (2.15/week) is clearly closer to 2. The question asks for the 'closest answer,' and whether we use the older or newer data, the range of 1.5-2.15 times per week is closer to 2 than to 1. I was being overly conservative in my initial assessment. The consensus of four other models all arriving at C through similar mathematical reasoning is compelling and well-supported by the data.

Grok 4.1 Fast

Vote: 2

Sticking with C (2). The core data from GSS shows 18-29 year-olds averaging 80-112 times per year across the full population (including singles/sexless, ~25-30% no sex past year). This yields 1.54-2.15 times/week. Even the low end (80/52 ≈1.54) is closer to 2 (distance 0.46) than to 1 (0.54). Surveys report 'times,' but question is 'days' with sex; multiples per day are rare (~10-20% of acts), so days/week ≈ times/week, still ~1.5+. B voters (GPT-5.4, Claude) emphasize declines/sexlessness pushing to '1-1.5,' but 1.5+ rounds closest to 2 mathematically, and they cite no precise calc below 1.5. Recent trends lower but not below midpoint. C aligns with majority data interpretations (Gemini, Kimi, Qwen) and my initial analysis. No arguments convinced a change; B understates by ignoring precise math favoring 2.

Qwen 3.5 397B

Vote: 2

After reviewing the arguments, I maintain my vote for C (2 days per week). The key data points from GSS and Kinsey Institute consistently show 80-112 times per year for ages 18-29, which translates to 1.5-2.15 times per week. The midpoint of this range (~96/year) equals approximately 1.85 times per week, which rounds closer to 2 than to 1. While GPT-5.4 and Claude Opus 4.6 raise valid points about including sexually inactive individuals, the GSS data they cite already accounts for the full population. Even using the more conservative 80 times/year figure (1.54/week), this still rounds to 2 as the closest whole number option. The 18-29 age group consistently shows the highest sexual frequency of any demographic. Option B would better represent the ALL-adults average, but for this specific age bracket, C remains the most accurate choice based on available survey data.

Gemini 3.1 Pro (changed mind)

Vote: 1

Claude Opus 4.6 and GPT-5.4 make a very compelling point that recent data has pushed the average down significantly. While historical peaks were around 112 times per year, more recent studies (like Twenge et al., analyzing GSS data) show the average for 18-29 year olds has dropped closer to 80 times per year. Eighty times per year equates to roughly 1.53 sexual acts per week. However, we must pay close attention to the specific wording of the prompt, which asks for the average number of *days* in a week, not *acts*. Because sexual activity can cluster (e.g., having sex twice on a Saturday), the number of active days per week will mathematically be strictly lower than the number of acts. Even a modest amount of same-day clustering pulls an average of 1.53 acts down to roughly 1.2 or 1.3 days per week. Therefore, 1 is the mathematically closest whole number. I am changing my vote to B.

Kimi K2.5

Vote: 2

Despite recent declining trends cited by others, the empirical consensus remains that adults aged 18-29 average approximately 1.5–2.1 sexual encounters per week. Even using conservative recent estimates of ~80 encounters annually (1.54 per week), this value rounds to 2, not 1, under standard arithmetic rules. The distinction between 'days' and 'times' is negligible for this estimate—most young adults spacing encounters across separate days rather than multiple times daily. While including sexually inactive individuals lowers the population mean, prevalence of inactivity (15–20%) is insufficient to drop the average below 1.5. Option B represents an underestimate that ignores rounding conventions, whereas C accurately reflects the closest whole number to established survey data.

Final Summary

The AI Roundtable reached a majority consensus of 2 days per week, though the debate was defined by a symmetrical 'switcheroo' regarding mathematical rounding. Claude Opus 4.6 defected to the majority after deciding that even conservative estimates of 1.54 acts per week round up to 2, while Gemini 3.1 Pro simultaneously defected to the minority, arguing that 'days' of activity are strictly fewer than 'total acts' due to clustering. GPT-5.4 remained the most vocal skeptic, insisting that the inclusion of sexually inactive individuals and modern declining trends makes 1 the only defensible population-wide average.

Majority chose "2" after discussion (4/6). Final vote: 1: 2, 2: 4

Strongest Arguments

• 1: The distinction between 'days' and 'acts' is critical; because sexual activity often clusters (multiple acts on one day), an average of 1.5 acts per week likely results in ~1.2 distinct days, making 1 the mathematically closer integer.
• 2: General Social Survey data shows 18-29 year olds average 80 to 112 encounters annually; even the low end of that range (1.54 per week) rounds up to 2 under standard arithmetic conventions.

Key Turning Points

• Claude Opus 4.6 abandoned its conservative stance, concluding that a 1.5+ average must round up to 2.
• Gemini 3.1 Pro pivoted from the majority to the minority, introducing the 'clustering' argument where 'days' are fewer than 'acts'.
• GPT-5.4 successfully influenced Gemini 3.1 Pro to change its mind by highlighting the impact of including non-active individuals in the population average.