**Core Concept**
The superficial perineal space is a fascial compartment located in the perineum, which is the region between the pubic symphysis and the coccyx. It plays a crucial role in the anatomy of the perineum, containing several important structures.

**Why the Correct Answer is Right**
The superficial perineal space contains the superficial perineal muscles, including the bulbospongiosus, ischiocavernosus, and superficial transverse perineal muscles. These muscles are involved in the innervation and innervation of the external genitalia. The space also contains the superficial perineal vessels and nerves, which provide blood supply and sensation to the perineal region. The deep perineal pouch separates the superficial perineal space from the deep perineal space.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the superficial perineal space does not contain the urethral sphincter, which is a structure located in the deep perineal space.
* **Option B:** This option is incorrect because the superficial perineal space does not contain the anal sphincter, which is a structure located in the deep perineal space.
* **Option C:** This option is incorrect because the superficial perineal space does not contain the obturator internus muscle, which is a structure located in the pelvic wall.

**Clinical Pearl / High-Yield Fact**
To remember the contents of the superficial perineal space, recall the "3 S's": superficial perineal muscles, superficial perineal vessels, and superficial perineal nerves.

**Correct Answer: D. Superficial perineal muscles, superficial perineal vessels, and superficial perineal nerves.**