Saturated fat is one of the best sources of energy for your body. It’s why your body naturally stores carbohydrates as saturated fat. How can you argue with one of the most basic structures of how your body was intended to work? Saturated fats are also some of the most satiating foods, meaning they keep you fuller longer. Research even shows diets that are higher in saturated fats are oftentimes lower in total calories. And, as we alluded to already, saturated fats boost testosterone, which as we’ve already mentioned about a hundred times, is what makes you a man.
The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.     
There are several relatively simple lifestyle changes a woman can make that might elevate T levels. Most obviously, if a woman believes her birth control pills are causing a problem and she feels she can adjust to a different type of birth control, she might stop using them (if indeed she's using them exclusively to prevent conception). She might also reevaluate her need for any of the various medications I mentioned, and perhaps seek alternatives that might not affect testosterone levels. For instance, there's some evidence that the antidepressant wellbutrin actually increases libido, but whether it helps the sex mojo through raising T levels or by some other mechanism isn't well understood.