They began to copulate, someone used spit to what?\nOptions:\n- lubricate\n- mark territory\n- kiss\n- procreation\n- release tension
Let's think carefully first. Step-by-step reasoning process:
User
Lubricating is the act of making something slippery to reduce friction. Spit is a watery liquid. Liquids are used to reduce friction between surfaces. So the final answer is lubricate.
Assistant