Chocolate contains phenylethylamine, theobromine and serotonin – the chemicals released when we are in love. Phenethylamine is related to amphetamines, which is a central nervous system stimulant that increases energy. Theobromine, the primary alkaloid has a mood elevating effect. Serotonin is a neurotransmitter that induces feelings of pleasure. Chocolate also increases testosterone levels in women. But most of its aphrodisiac qualities are linked to the simple pleasure that it gives on consumption. Some dark chocolate benefits are also due to caffeine, which is present in small quantities.