Proverbs 5:8-11:

Remove thy way far from her, and come not nigh the door of her house:
Lest thou give thine honour unto others, and thy years unto the cruel:
Lest strangers be filled with thy wealth; and thy labours be in the house of a stranger;
And thou mourn at the last, when thy flesh and thy body are consumed,

See also:

Am I Sick Because I Left a Door Open to the Devil?

If You Are Sick, Does That Mean There is Sin in Your Life?

Condition: Venereal Diseases