Final answer:
Increased scrotal temperature can be caused by environmental factors such as using a laptop directly on the lap or wearing tight clothing, as well as infections like epididymitis and orchitis.
Step-by-step explanation:
The two causes of increased temperature within the scrotum are epitomized by environmental and physiological factors impacting this sensitive region. External factors such as prolonged laptop use on the lap and engaging in activities like soaking in hot tubs, wearing tight clothing, or excessive biking can cause a considerable rise in scrotal temperatures, potentially reducing fertility. Meanwhile, internal physiological factors include infections such as epididymitis and orchitis, which can induce inflammation and elevate the temperature of the scrotum, disrupting the optimal environment required for spermatogenesis.