There are four types of olfactory stimuli, and standard error bars are shown. For intensity, 1 refers to no smell, 2 little smell, 3 moderate smell, 4 quite a bit smell, 5 strong smell. For pleasantness, 1 refers to very unpleasant, 2 unpleasant, 3 neutral, 4 pleasant, 5 very pleasant. Sex: sexual sweat, Neutral: neutral sweat, PSP: putative sex pheromone androstadienone, PEA: phenylethyl alcohol. Sexual sweat and PSP were perceived to be more intense than Neutral sweat; PEA was perceived to be more pleasant than Sexual sweat and Neutral sweat. *: P < 0.05, Bonferroni corrected.