A crop is a type of sex toy that is typically used for spanking or other forms of impact play. To use a crop in bed, you can try gently tapping your partner's skin with the crop, gradually increasing the intensity of the impact. You can also try using the crop to create different sensations, such as swirling it around your partner's body or using the tip to apply more focused pressure. It is important to communicate with your partner and establish clear boundaries and limits before using a crop or any other type of sex toy. You should also make sure to use the crop safely and avoid causing any unnecessary pain or injury.