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Multimodal mate choice593with them; d) whether their partner would like to go on another date with them; e) whether they knew each other from before. Answers on questions a, b, and c were very strongly correlated (Supplementary Tables 1-2). Participants were given approximately 1 min to fill in the scorecard. After each date, men moved one seat to the left.In each group, the number of speed-date rounds depended on the number of participants in each group per sex, with a maximum of 10 rounds. In addition, if the number of men and women was not equal, the overrepresented sex had one or multiple rounds without a speed-date. In total, the experiment consisted of 277 speed-dates, thus resulting in 554 filled-in scorecards.Data processingBecause of technical issues, in the second female group (N = 8) we could not collect data for the vocal and visual rating task, and thus had to exclude them from further analysis. Second, one of the auditory stimuli that was used in the third female group did not match with the male in that group. Therefore, all data for the male whose auditory stimulus was missing was excluded from analysis. Third, one male in the second group did not complete the visual rating task. Fourth, we excluded all rows in which the participant had scored the olfactory rating with a 0, as this was an indication that the participant could not make a choice based on the sample.After excluding the above-mentioned data, we first tested how strongly the attractiveness ratings correlated with long-term partner suitability ratings using Bayesian ordinal regressions (see Data Analysis). Because the two questions were always asked together, and in the same order, we suspected a carry-over effect, resulting in almost identical ratings for attractiveness and long-term partner suitability. This was indeed the case for all three modalities (Supplementary Tables 3–6). Because of the strong degree of correlation, we used only the attractiveness ratings in our further statistical analyses. We chose attractiveness ratings over long-term partner ratings because the former are more straightforward and align better with the relatively short-term context of a speed-date event. The full dataset based on the attractiveness ratings of all three modalities and speeddate outcomes included 457 complete cases after exclusion of data as described above. For the independent models, we used all complete cases of the specific modality (visual: 482, auditory: 481, olfactory: 533; Supplementary Table 7).Tom Roth.indd 59 08-01-2024 10:41