If you’ve never tried a lubricant before, I really encourage it. It’s not for people with a “problem”. Your partner isn’t doing anything wrong if you need a lubricant (and neither are you!). If you’re taking hormonal birth control, antihistamines, or antidepressants, you might notice a decrease in natural lubrication. You can use lube to last longer (no chafing!), have shower sex (silicone!), or add flavor to oral.
Sliquid has two lines, Natural and Organic. Both are glycerin- and paraben-free, which makes them suitable for even the most sensitive bits. Both are completely vegan. The big difference is that the Organic line uses – duh – organic ingredients. It’s entirely up to you which you try. My body gets along perfectly with the Naturals line, and I don’t make too great an effort to shop for organic food.