[Description of Vrishya] Any article which is sweet, unctuous, life promoting, nourishing and heavy to digest and causing mental excitement, is to be regarded as virilific.
Therefore, a person, first of all be impregnated with these articles, should approach for his woman. He gets excited by his own urge and also by the erotic attributes of the woman.
यथा मुकुलपुष्पस्य सु(ख) गन्धो नोपलभ्यते| लभ्यते तद्विकाशात्तु तथा शुक्रं हि देहिनाम् ||३९||
An unblossomed bud does not possess fragrance but fragrance appears when it blossoms. Similar phenomenon takes place in case of semen of the living beings.