（全）剑桥英语语法在用 初级 Essential Grammar in Use 4th

Choosing the right lube matters more than most people realize. Just because something feels slippery doesn’t mean it’s safe. Skip the shampoo, conditioner, lotion, baby oil, Vaseline, and cooking oils. They can irritate sensitive tissue, increase the risk of infection, or damage condoms. Water-based lube is a solid choice, but you’ll likely need to reapply. Silicone-based lube lasts much longer and is my go-to for anal sex. Just don’t use it with silicone toys. Your lube should make sex better,