Swiss Navy Silicone Lube
Silicone molecules are too large to be absorbed into skin, so silicone-based lubes tend to last much longer than water-based lubes. If you’re looking for a high-quality silicone lube that you can apply once and then romp for hours, Swiss Navy Silicone Lube is the one for you. Its long-lasting formula is velvety smooth and perfect for water play because it won't wash off in the tub or spa. (Of course, this does mean that it's harder to wash off when you actually do want to wash it off, so be sure to thoroughly clean yourself with soap and water after the fun.)
Just don't pair silicone-based lubes with silicone toys. If you think back to your high school chemistry class, "like dissolves like", so silicone lube will break down the surface of silicone toys and make them gummy and gross. However, Swiss Navy Silicone Lube is perfectly safe to use with any plastic, glass, or metal sex toys as well as vaginal and anal sex, and most condoms.