**Core Concept**
Sexual intercourse without consent, especially with a minor or someone who is incapable of giving consent, is a form of rape. The law defines rape based on the age of the victim and the nature of the relationship between the perpetrator and the victim.

**Why the Correct Answer is Right**
Rape is defined as non-consensual sexual intercourse with a victim below a certain age, which varies by jurisdiction. In many countries, including India, the age of consent is 18 years. Therefore, sexual intercourse with a woman above 20 years is not considered rape, as she is above the age of consent. This is because the law assumes that an individual above the age of consent is capable of giving informed consent to sexual activity.

**Why Each Wrong Option is Incorrect**
**Option A:** Sexual intercourse with a wife below 15 years is considered statutory rape, as the law recognizes that a 15-year-old is a minor and incapable of giving informed consent. This is a form of rape, regardless of the relationship between the perpetrator and the victim.
**Option B:** Sexual intercourse with a wife above 15 years but below 18 years may be considered statutory rape in some jurisdictions, depending on the specific laws in place. However, in this case, the wife is above 15 years, which is the minimum age of consent in some jurisdictions, but below 18 years, which is the age of majority in many places.
**Option C:** Sexual intercourse with women below 16 years is considered statutory rape in many jurisdictions, as the law recognizes that a 16-year-old is a minor and incapable of giving informed consent.

**Clinical Pearl / High-Yield Fact**
The age of consent varies by jurisdiction, and it is essential for healthcare providers to be aware of the laws in their area to provide accurate information and support to victims of sexual assault.

**✓ Correct Answer: D. Women above 20 years**