![Any idea of what this substance can be? We stayed at an airbnb the other weekend and apparently this build up was in the hot tub after we left. The Airbnb host Any idea of what this substance can be? We stayed at an airbnb the other weekend and apparently this build up was in the hot tub after we left. The Airbnb host](https://preview.redd.it/any-idea-of-what-this-substance-can-be-we-stayed-at-an-v0-f14sasc2xxpa1.jpg?width=640&crop=smart&auto=webp&s=6e341bc0e58659fd2841379c7b2d9b72b5f9e9b9)
Any idea of what this substance can be? We stayed at an airbnb the other weekend and apparently this build up was in the hot tub after we left. The Airbnb host
Myles Spar, MD - With sperm counts on the decline, men are increasingly affected by infertility. Here are four ways to boost male fertility and increase sperm count. 1. Work out, but
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Facts And Myths Of Male Fertility: Tight Underwear, Hot Tubs, Marijuana, And More | Office for Science and Society - McGill University
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