are you even suppose to be able to reach 100% in this game? for example, how can you meet Aly right after the plane if she wasnt your plane girl?
All "plane girls" (the special ones, Amy, Yvette, Lacey, Aly etc) starting scenes are carried throught saves (permanent unlock). Do them once and load your"main saves".
Example Amy. See the "P" for Permanent in her gallery ?
All "girls arrival on the island" can be redone : send the girl off the island and invite her back once she is gone.
You can unlock 100% of the current contents on one save per se.