I don't think there's a way to check each members RP without talking to them, usually in the home base when you talk to them through Simon, the top dialogue box shows the RP points. In this case you'll have to use the wiki, this link might help -Hello! I was wondering if there's any way to view relationship points with a harem member without talking to them first?
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, for that you'll need to remember which decisions you made for each character and then count the coinciding actions and points, to know how much RP each of the Harem Members have.