The research looked at how sperm are released from a storage site in the female reproductive tract before fertilization. Scientists found that a hormone called progesterone helps release sperm from this specific site. The study suggests that progesterone is an important factor in triggering the release of sperm in the female body, allowing them to move towards the egg for fertilization. This hormone plays a key role in this process, indicating that it plays a significant part in how sperm move within the female reproductive system.