**Core Concept**
Transvestism is a type of paraphilia characterized by a recurring and intense sexual arousal to wearing clothing typically associated with the opposite sex. This behavior is distinct from cross-dressing, which can be a form of self-expression or a coping mechanism, but may not necessarily involve a sexual component.

**Why the Correct Answer is Right**
In transvestism, the individual derives sexual gratification from wearing clothes of the opposite sex, often as a way to express a gender identity that differs from their biological sex. This behavior can involve wearing dresses, skirts, or other feminine clothing, and may be accompanied by other paraphilic behaviors. The underlying psychological mechanism is thought to involve a desire for emotional comfort, self-expression, and sexual arousal associated with the opposite sex.

**Why Each Wrong Option is Incorrect**
**Option A:** Necrophilia refers to a paraphilia involving a sexual attraction to corpses, which is unrelated to the behavior described in the question.

**Option B:** Fetishism is a paraphilia involving a sexual attraction to non-living objects or non-genital body parts, which may or may not involve clothing. While fetishism can involve clothing, it is not the primary characteristic of the behavior described in the question.

**Option C:** Frotteurism is a paraphilia involving a sexual attraction to touching or rubbing against non-consenting individuals, often in public places. This behavior is unrelated to the use of clothing for sexual gratification.

**Clinical Pearl / High-Yield Fact**
Transvestism can be distinguished from other paraphilias by its specific focus on clothing and gender identity. A key clinical consideration is the potential for transvestism to co-occur with other paraphilias or mental health conditions, such as depression or anxiety.

**✓ Correct Answer: D. Transvestism**