The repetition of the coitus without washing the parts ought to be shunned, as it may enfeeble the virile power. The man must also abstain from copulation with his wife if he is in a state of legal impurity, for if she should become pregnant by such coition the child could not be sound. After ejaculation do not remain close to the woman, as the disposition for recommencing will suffer by doing so. Care is to be taken not to carry heavy loads on one's back or to over-exert the mind, if one does not want the coitus to be impeded. It is also not good constantly to wear vestments made of silk, as they impair all the energy for copulation.
Silken cloths worn by women also affect injuriously the capacity for erection of the virile member.
Abstain from greasy liquids, as in the course of time they diminish the strength necessary for coition. The effect of snuff, whether plain or scented, is similar. Conversation with a young woman excites in a man the erection and passion commensurate with the youthfulness of the woman. This will procure for him a marvellous effect in making love. It is said that reading the Koran also predisposes for copulation.