I unlocked 5 of the 6 women but no resin. I have not been able to figure out how to unlock the last lady either.
Pretty sure that you get told what you need to do to unlock them, when you are taken to the Stasis room and advised that female X will be the next one to be woken up.
Can't remember the unlock criteria for each now, but once unlocked you then unlock a sex scene with them by increasing your Morph ability, in the Genetics Lab, so that you can alter your cock to suit them.
I have 7 unlocked, 1 seems to remain in the Brig, or the Milking room at the moment - AFAIK the 7th female was not "unlocked" by meeting specific criteria, she came via an event where 2 aliens boarded the ship.
Spoil
Is Clay available yet?
I have 1k+ of most raw materials, but 0 Clay.
I also have 0 for all processed materials. Are they available yet?
*Edit: OK, found how to create processed materials, using the Refine Materials option in the Recycling Centre. Still not got any Clay, though.