"Consider one study from 1974. Researchers had an attractive female interviewer stop one group of men crossing a scary suspension bridge and another one crossing a bridge that wasn’t scary. The women asked the men to fill out a questionnaire. The men on the scary bridge responded to the questions with more sexual content, and were significantly more likely to try to contact the interviewer after it was over. This suggests that the men on the scary bridge interpreted (unconsciously) their body’s reaction to the bridge as added attraction to the interviewer."
Personally, I would conclude that the men felt more confident about their chances after having demonstrated their capabilities as worthy mates. Additionally, after having overcome the bridge, they were now ready to try their chances at the challenge of wooing the researcher.