Most women dislike fat men, and excess adipose tissue interferes with metabolic health that is responsible for erections and testosterone levels. Researchers from Australia concluded that overweight men often have lower levels of testosterone and the biologically-active free testosterone. To make matters worse, age-linked declines in testosterone take place faster in overweight and obese men.
Obesity increases risk factors linked to low testosterone levels, such as obstructive sleep apnea, insulin resistance, and type 2 diabetes. Excess body fat, predominantly in the abdomen, interferes with hormones that manage the reproductive system and decreases sperm quality. Weight loss increases testosterone and free testosterone and improves sexual health. The general conclusion is that obesity is bad for your sex life.