"Hot" - Hot Spices besides Chilli

Chilli is probably, looking at worldwide usage, the most important hot spice,
but there are - actually, pretty few, others...

• Piper nigrum
• Piper longum
• Piper cubeba
• Grana paradisi
• Sansho
• Wasabi
• Azabu-tade
• Ginger and relatives

... and why do humans like the pungent taste anyways?