It was probably hard to see sweaty upper lips in a crowded bar with the small TVs they had in those days. I’m not sure what sexual innuendo you see there. It was more just a comment on marriage.
OK. The discussion in the press was about the sweaty lip. See http://www.slate.com/articles/news_and_politics/politics/2014/10/rick_scott_charlie_crist_and_a_fan_campaigns_have_fought_over_the_rules.html and read the paragraph beginning “In their first debate.”