Talk:Monsterization/@comment-38413939-20190217095540/@comment-29602226-20190217102950

Infinite Spirit Energy:

Incubi can absorb the DE of their mamono partners, and produce SE. When an Incubi and a mamono have sex, both are returning more energy than they took from their partners, breaking the laws of thermodinamics...

A mamono can use her own DE to make a normal man stay erect and produce semen for a long time, but he will eventually run dry and the mamono will need to spend more of her own energy to keep him going than what she is getting from the sex.

With incubi, that's not an issue. Both partners can go on indefinitely and both get more energy than they invest in the act...