A progesterone blood test is done to find out how much of the progesterone hormone is in a sample of blood. This female hormone is produced each time a mature egg is released from an ovary after a process referred to as ovulation. This hormone really helps to prepare the endometrium (uterine lining) to take the egg if sperm fertilizes it. If the egg goes without being fertilized, menstrual bleeding occurs and progesterone levels drop. An adrenalin-pumping experience like watching a horror movie or something as daring as jumping from an airplane can make you feel more amorous towards your partner. This is a fact that is supported by studies. The main reason behind this is that you do something daring or adventurous your heart begins pumping hard and that's exactly what it does when you get sexually aroused. So, as a contraceptive method, its success is limited! However, doctors do not recommend doing so because: Osteoarthritis is the most common type of arthritis in the United Kingdom and affects about 8 million people.