I always found instilling a sense of trust and closeness was always tied to the amount of physical contact you make with that person. Handshaking is great but just half the story, consensual proximity to the person you're talking or trying to convince is important, even to the point of intimidation (even though I know this is hard for most of you don't be a fucking weirdo and make sure the receiving end is not reacting negatively). Touching the person's shoulders and patting them on the back have been shown to yield significant results in getting people less risk averse, if the person doing the touching is female (http://pss.sagepub.com/content/21/6/804.long horrible methodology and small trail groups mean that this study is very unreliable but it still strengthens the point) however I suspect that it works for both genders.