Lots of eye contact is sufficient if the people are both single, of similar age, and with a person of their preferred gender. But even those conditions could be overcome given some chemicals to play with.
Did you accidentally leave out some conditions such as “reasonably attractive”?
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.