Lubricants and Oils

Lubricant is the cheapest thing you can do to improve everything else you own. Water-based is safe with every condom and every toy and is the right default; silicone-based lasts far longer but will ruin a silicone toy.

Glycerin-free and unscented suits most people for regular use. Buy the large bottle — the small ones are poor value, and the usual mistake is using too little.