Please kiss every 10 minutes"When people in red kiss over and over again, will it be the first time that a fire comes on to face-to-face sex?

For the first time, a man and woman who meet under the name of psychological surveys spend their time under one roof. Free action is OK, but there is only one rule. That is, "I kiss when the chime rings". The chime rings every ten minutes and has to kiss each time. If a man and woman I just met kiss over and over again -- What are the actions taken by two people without knowing that they are being photographed?