The bioactive Glygopeptide compounds in Tongkat Ali have been proven to increase free testosterone and decrease SHBG levels in human medical trials. The most common species are: the African Spurred tortoise (Geochelone Sulcata), the spotted turtle (Clemmys guttata), the wood tortoise (Clemmys insculpta), the green turtle(Chelonia) the Blunding?s turtle ( Emydoidea Blundigii), Trachemys s. elegance (red-eared slider) along with the diamondback terrapin (Malaklemys terrapin). It has been recommended that men try to keep their ejaculation frequency as a result of just a few times weekly; however, those that have healthy sex lives who participate in intercourse (thereby ejaculate) on almost a daily basis might argue this advice to be preposterous. Also there are women who would do masturbation.