Pot could decrease libido and fertility in some heavy-smoking men.

There is also experimental data demonstrating that paternal exposure decreases fertility and alters brain development in offspring.

Meisenberg (2009) found that both GDP and intelligence independently decrease fertility.

In the 1960's the birth control pill caused an increase in sexual activity despite its role in decreasing female fertility.

Contrary to widely held beliefs, no evidence supports that wearing constrictive underwear, or "briefs," decreases fertility.

More people have had sexually transmitted diseases (STDs), which can decrease fertility.

A 1993 study raised concerns that polysorbate 80 might decrease fertility in rats.

Other side effects include high blood pressure, headache, agitation, weight gain, impaired memory and paresthesia, decreased fertility.