Abstract
Eurycoma longifolia was preliminary investigated for aphrodisiac property on sexually naive male mice using both the modified runway-choice and open field methods. The animals were conditioned to seek, either an estrous female, a measure of right choice for sexual motivation or a male mouse, a measure of wrong choice, within two minutes. However, male mice which failed to response within the stipulated period were considered as having no choice. Oral administration of 0.5 g/kg daily of different fractions of E. longifolia viz., chloroform, methanol, water and butanol resulted in an enhancement of the sexual motivation of the animals after three days post-treatment and the effect was more prominent after eight days post-treatment.