LoB verse 11
11. In the rainy season, when the rivers swell and rush to the ocean, and as the wind blows the waves about, the ocean appears to be agitated. Similarly, if a person engaged in the mystic yoga process is not very advanced in spiritual life, he can be affected by the modes of nature and thus will be agitated by the sex impulse.
A person fixed in spiritual knowledge will not be attracted by the allurement of material nature in the form of beautiful women and the sex pleasure enjoyed in their association. One, however, who is still immature in the cultivation of spiritual knowledge may be attracted at any moment by the illusion of temporary happiness, just as the ocean is agitated by the rushing rivers and blowing wind that occur during the rainy season. It is therefore very important to fix oneself at the lotus feet of a bona fide spiritual master who is a representative of God so that one will not be carried away by sex agitation.