Thinking this line AJ would most likely even use available genetic reconfigurations to ensure an androgynous look. Most likely that's also the reason for their greyish/silvery eyes, hair and nails.
Kira, has most likely done something similar for her extrem dark lips. Otherwise her purple-ish eye is a result of the desaster at Friendship Station. Her pale skin (in comparison) is do to her spacer backround (low UV exposure).