다음 중:Is it beautiful to be friends? Teaching the secret to a happy marriage! When you say husband and wife in one word, there are many different situations. This work includes the sexual activities of four couples, including a middle-aged couple in their 40s, a couple with an age difference, a remarried couple, and a young couple! The secret to a happy marriage told by each unique couple...it lies in having sex that you can enjoy no matter how old you are! Intense sex that doesnt loosen up, sex that makes your husband feel like it, sex that stays connected from morning till night, etc. These are the secrets of married life!