Devendra Singh, a psychology professor at the University of Texas in Austin, asked women to wear one T-shirt at night during the most fertile phase of their menstrual cycle (13-15 days after their previous period), then wear another T-shirt during the infertile phase of their cycle (days 21 to 22).Men Can Smell Fertility, Study Says
Aside from acquiring two previously unworn cotton T-shirts, the women were also given unscented clothing detergent, soap, and shampoo to use for the duration of the study. They were asked not to wear perfume, and avoid products and foods that would emit a strong odor. They were also asked to refrain from sexual activity and to not share a bed with anyone, not even a pet, during the study.