Lubrication is important because it makes the process more comfortable, and it can prevent skin irritation. When using a strong G-zone stimulator for women, you will want to use lubrication to make sure that your skin doesn't get irritated by the vibrations of the toy. Some people prefer to use silicone-based lubricants (like Wet Platinum), but oil based lubes are also fine. Just avoid using anything that is both silicone and glycerin-based (like Pjur Woman).