Please answer the following question by reasoning step-by-step.
What is a way for two people to communicate to each other that they are in love?\nOptions:\n- pain and suffering\n- do stupid things\n- deaths\n- having sex\n- high five

having sex
Sex is a way of physical intimacy for people in love.

Sex is an act of love.

Sex shows commitment which shows love.

.

Therefore, the answer is having sex