Answer:
Lloyd and Luna are using a method of birth control that is based on ovulation prediction. This couple is using a rhythm or calendar method.
Step-by-step explanation:
A rhythm or calendar method is natural birth control method which consists of avoiding having sexual intercourse during the days of ovulation. It's a natural method as there's no use of any contraceptive. However, its effectiveness is not very high as the ovulation must be calculated very thoroughly and that's not so easy to do. It's generally used by people who want to conceive: they calculate the ovulation days to schedule their sexual activity to have more chances to conceive.