**Core Concept:** Ectopic pregnancy is a severe complication of unprotected sexual intercourse or contraceptive failure, where an embryo implants outside the uterus, often in the fallopian tube. Risk factors include prior pelvic infections, smoking, and previous ectopic pregnancy.

**Why the Correct Answer is Right:** The correct answer is D, which refers to the use of male condoms as a contraceptive method. Male condoms provide only partial protection against pregnancy due to their incomplete barrier coverage. In the event of contraceptive failure, the risk of ectopic pregnancy is higher with male condoms compared to other methods like intrauterine devices (IUDs), contraceptive injections, or implantation.

**Why Each Wrong Option is Incorrect:**

A. Female sterilization methods (tubal ligation or vasectomy) do not increase the risk of ectopic pregnancy. These methods provide full sterilization by blocking the fallopian tubes in females or the vas deferens in males.

B. Oral contraceptive pills (OCPs) are combined hormonal methods, increasing the risk of venous thromboembolism (VTE), but not ectopic pregnancy.

C. Emergency contraceptive pills (ECPs) act as a single dose of hormonal contraception, reducing the risk of pregnancy by inhibiting ovulation, but do not prevent ectopic pregnancy in case of contraceptive failure.

**Clinical Pearl:** Contraceptive failure with male condoms results in a higher risk of ectopic pregnancy compared to other methods. This emphasizes the importance of using combined hormonal methods or long-acting reversible contraceptives (LARC) like IUDs, injections, or implants for better contraceptive efficacy and reduced pregnancy complications, including ectopic pregnancy.