The kiss explorer Fred (Peter Knaack) is celebrating his 39th birthday with a prostitute. He is still married, but his wife, whom he still loves, lives apart from him and wants to get a divorce. Luzie (Katharina Lorenz) and Sibil (Seyneb Saleh) who have a lesbian relationship, live in a blue house in the countryside, but Sibil also has also a relationship with Peter (Max Wagner). Luzie writes about a novel about the soul-life of the men, while Sibil simply lays in the day. Fred invites young couples to his lab to kiss for a quarter of an hour for his research.