You have to reach an agreement and interact with your partner regarding what you both want from the encounter. It is so essential to have an in-person conversation about what you desire and what would be off-limits.
Besides communicating, you have to know which part is safe to be struck. You usually target areas on the body that are noticeably thicker and with more intramuscular fat.
If you prefer slapping, keep in mind to avoid the eyes, nose, and mouth, and place your palm on your cheek.
It’s a wise choice to test on the pillow before starting an impact play.