Table with Cups and Sachets (IMAGE) University of Göttingen Caption To test whether women's preferences for certain behaviours differed according to their fertility, the researchers used saliva analysis to analyse hormone levels and highly sensitive urine ovulation tests to pinpoint the ovulation date. Credit Julia Stern, University of Göttingen 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.