Both men and women can improve their odds of avoiding STD's by urinating within a few minutes after intercourse. Urine washes away many germs. So can soap and water. But douching is debatable. It may force organisms up into the cervix, or mask STD symptoms.
Some sexual practices can increase risk.
Oral-anal contact transmits hepatitis A and other intestinal infections. Oral-genital contact or anal intercourse can also spread disease to other parts of the body, including the throat and anal canal. Because the one time you do without protection may be the only time you need their protection at all. If you choose to use a condom, be sure you know how, why, and when. Using a condom the wrong way can be as bad as not using one at all.