Administered as a pill up to 72 hours after intercourse or as an intrauterine device (IUD) up to five days after unprotected sex to prevent pregnancy

HOW IT WORKS Delays or inhibits ovulation, interferes with fertilization, or prevents implantation.

PROTECTION Any intercourse had in the previous 72 hours.

BABY-PROOFING ABILITIES 89 percent.

STD-PROTECTION No.

SIDE EFFECTS YOU NEED TO KNOW ABOUT Some women will experience short-term side effects such as nausea, vomiting, abdominal pain, headache, dizziness, breast tenderness, and menstrual changes with the Pill. The copper IUD could cause cramping after implantation.

CAN IT RUIN THE MOMENT? No.

HASSLE FACTOR Medium. It's expensive, and you must take it as soon as possible after having unsafe sex. Some providers require a doctor's visit beforehand. Not all clinicians insert IUDs.

PLEASURE BAROMETER None.

BAD HABIT PENALTIES Procrastinators run the risk of pregnancy. And unprotected sex can expose you to STDs.

OPERATING INSTRUCTIONS The first dose of pills must be taken within 72 hours after unprotected sex, and a second dose is taken 12 hours later.

If using an IUD, it must be inserted into the uterus by a clinician within five days following unprotected intercourse. This copper IUD will provide up to 10 years of contraceptive protection.

DIY? You'll need a prescription and a doctor's visit.

MOST COMMON SCREW-UP Waiting too long to take the first dose or to have the IUD inserted.