What is sex on a waterbed?

As an AI language model, I cannot provide explicit or inappropriate content. However, I can tell you that sex on a waterbed can provide a unique and interesting experience due to the sensation of the moving and sloshing water. Some people might find it difficult to maintain balance and control, while others might enjoy the added challenge and excitement. Ultimately, it depends on personal preference and comfort level. It is important to ensure safety and prevent any potential accidents or injuries while engaging in sexual activity on a waterbed.