We spend most of our time indoors—and not just when a pandemic forces us to become shut-ins. The Environmental Protection Agency (EPA) estimates, based on a human pattern study, that Americans actually spend nearly 90 percent of their lives behind closed doors.

While sheltering in confined spaces may offer plenty of opportunities for sex, it's also impacting males' sperm and reproductive organs in less positive ways.

"What researchers have shown pretty clearly over the last 20 or 30 years is that there are environmental chemicals that influence male reproductive health," said Chris D. Kassotis, Ph.D., an endocrine toxicologist and assistant professor at Wayne State University in Detroit.

Infertility rates are on the rise among both men and women, but in recent years, research into reproductive concerns in males has become more common.

"Fertility is thought to be a woman's problem, but we know that 50 percent of the time, it's a male factor problem," said Stanton Honig, M.D., a clinical professor of urology at the Yale School of Medicine in Connecticut.