Slow-moving Sperm (VIDEO) Washington State University This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Washington State University researchers have seen how the lack of an enzyme in the uterus can keep semen in a gel-like state, making it hard for sperm like these to swim towards an egg. Credit Washington State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.