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The three female variants have different egg-laying behaviors:
* Common beige females remain dormant until a male inseminates them through anal sex, after which they lay fifteen eggs in Steele's anus that gestate for one week and hatch into normal butt bugs.
* Uncommon green females will continuously lay one egg in Steele's anus every eight hours. These eggs remain until inseminated by a male through anal sex, after which they gestate for only an hour and hatch into normal butt bugs.
* Rare orange-striped females remain dormant until a male inseminates them through anal sex, after which they lay a single large egg in Steele's anus that gestates for ninety days and hatches into an intelligent hybrid. 
** Orange-striped females are particularly large and cause significant but temporary gaping when first infesting the player character.
** According to the [[$link-5|Codex]], hybrids inherit several traits from their carriers. At the moment, however, Nursery descriptions barely change to reflect this.