Some bodybuilders and athletes use trenbolone esters for their muscle-building and otherwise performance-enhancing effects.  Such use is illegal in the United States and many other countries. The DEA classifies trenbolone and its esters as Schedule III controlled substances under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia .  The infamous "duchess" cocktail administered to Russian athletes at the Sochi Winter Olympics consisted of oxandrolone , a metenolone ester, and a trenbolone ester. 
The decline in both female and male libido can be linked to the decline in secretion of HGH in the body. Sexual potency and HGH levels are high in puberty, however diminishes throughout as you percent of men have erection problems as they approach 80 years. A clinical study in South Africa conducted of about 300 ageing adults proved that HGH treatment boosted sexual potency in about 75 percent of men. Furthermore, interviews conducted on people in Denmark using HGH therapy to slow down aging process indicate both men & women experienced improvement in sexual function and libido.