If I'm right, that the Mrs G/Mom feud is the most important path, the multiple paths should start when an active 3rd babe (Gina is inactive, Officer Kunt has agreed to a date with Joey so she's a possibility, both Mrs Jackson and Mrs Kelly have been mentioned by Mom as her friends so them too) reach 3-Heart status. At present, Gina has 4, Mrs G and Mom 3, Mrs K and Officer Kunt 1.
The Tablet measures "affection". But it's very unclear what this actually is. Why should Gina have a 4? Surely, Mrs G deserves at least equality. Mom's affection is mainly motherly affection rather than sexual affection. Surely a 3 is too high for her. These comments would still be true if we measured "positive" affection. Although I'd like this better that Mrs G would deserve her 3, surely Gina should get a 2, at best.
So, no direct co-relation to imminent sex. We'll know more about this when we have collected more data from more characters (I will travel all paths).