Present invention provides an efficient way of enhancing male erectile function, without the fear of unknown long-term ill-effect as a result of taking medication orally. The additive of present invention can be used by condom manufacturers directly as part of the lubricant coating. The composition of the additive pursuant to present invention will cause the dilating and expansion of arteries sending blood to the chambers of corpora cavernosa and corpus spongiosum, and at the same time, cause the restricting and contracting of veins that take blood away. As a result, the hardness of penile erection is increases. Particularly, the staying power is enhanced and time of erection is prolonged, leading to increased sexual intercourse time and better sexual satisfaction.