You can get eggs when breeding new offspring. Life Juice can unlock special animal when you meet the goddess of life in Galaxy 5, 100% repopulation will unlock random wild sex scene.
ah~ okay, it's odd cause I've only ever gotten the one egg from my first offspring, every one after that has not yielded any more eggs. And I have noticed the wild sex scenes after 100% but I'm curious if there's a point to going over that, like do more appear per 100 percentile? Or what happens?