Desserts are often associated with sex. They can be fun, sweet, and sensual but Davidson says to think twice about a romantic sundae date. "I would avoid any type of high-sugar dessert," say Davidson. "That can cause an insulin rise and crash, and that can cause the hormone levels to drop a little bit." One study from 2013 found that consuming glucose significantly dropped the testosterone levels of 73 out of 74 men for two hours.