A profession almost as old as the world wide web itself — the cam model. They flex, pose, tease, and more — some are just in it for the money, some get off on the attention, and for others it's a mix of both, but none of that matters when you’re on the other side of the screen enjoying the visuals.
Like with anything, it's important to be careful with how you spend your money. The forum Young Muscle Studs has a subforum on this. Check it out to see which cam guys are generally reliable and which ones aren't before contacting them.