Random erections while wearing speedo?

[Torchwatch]

If you feel yourself beginning to have a random erection then jump rapidly into some cold water, roll over face down on your towel while sunbathing or comment on a funny looking cloud that looks like a duck overhead. If all else fails talk about something boring or think about paint drying.
Bluff it out, act casual and most people will either not notice or not mind.
Doing something really obvious like suddenly locking your hands over your groin and running away will be embarrassing for everyone.
The more you are concerned about getting an erection the more likely you are to get one but once you get used to being in speedos you'll forget about it.