The article said there might be "missing cues of fertility that would otherwise increase sperm production" which reminded me of "study shows that when men smell

The article said there might be "missing cues of fertility that would otherwise increase sperm production" which reminded me of "study shows that when men smell T-shirts worn by women while ovulating, it triggers a surge in the sex hormone testosterone" [1] which would be exactly such a cue of fertility. [1] https://www.webmd.com/men/news/20100115/womens-scent-triggers-hormone-surge-in-men https://www.webmd.com/men/news/20100115/womens-scent-trigger...