Well... when a mommy dempsey and a daddy dempsey love each other _very_ much...
Seriously though, they are egg layer. A breeding pair will clear off a flat rock, or dig a large open pit and the female will deposit eggs, which the male will fertilize. If you're planning on breeding JD's plan on having a 40-50 gallon tank for them to spawn in (with excellent water quality) and a few more tanks that size for growing out the fry.
~JW
