Most sex toys function better with the strategic application of some kind of lubricant. Lubes can be oil based, but the most popular are generally water based to rinse off easily in the sink or the shower. You'll find lubes that come scented or unscented, flavored or unflavored, depending on what you're going to use them for. In the end, a little baby oil or ky jelly will generally get the job done effectively for a minimum outlay.