No, it isn't. While millions of sperm are released in the process of ejaculation, few are healthy enough to survive the upstream swim through acidic vaginal fluid. Because the course each sperm must run is so rigorous, it is easy to see why an insufficient sperm count diminishes a woman's chances of getting pregnant. Forty percent of pregnancies wouldn't take effect with a sperm count of only 500,000 sperm per milliliter. We have to improve the quality of those sperm that are present.
Heat is a well-known factor in reducing men's sperm count.
Under the circumstances, men with low sperm counts would do well to abandon wearing tight underwear, which keeps their testicles close to their bodies, in favor of wearing loose underwear, which allows their testosterone to remain stored in their abdomens until needed. Males with fertility problems often experience elevated testosterone temperatures. Wearing cotton underwear can help lower this temperature. Also helpful is for these men to remind themselves to stretch their legs after being seated for any length of time. Another problem facing us as a society is our use of synthetic hormones.