I worked as a swimming instructor for a few years, and it's something you're thinking about non-stop. When you pick up a kid to put them on the edge of the pool, you're holding them way out from your body, hands under their arms, angled so that parents watching can see exactly what you're doing. If you're a good instructor, the kids start to like you and try to hug you, or jump on you, and you extricate yourself from that SO fast, even though it's a totally innocent situation. Admittedly, the risk is out there (nothing attracts weirdos like a public pool), so I think it's appropriate, but it sucks that it has to be that way and makes teaching swimming lessons really stressful if you're a guy. The best thing you can do to make it more comfortable is just address it head on, let them know what equals a risky situation, and how to avoid putting themselves in a potentially bad position. Nothing will prevent guys from feeling paranoid about it though.