I would say there are many more, around 70-75% (if not 80)... In the love storyline, the scene will be ONLY with you, in the NTR storyline, the scene can be with multiple characters... for example - Frisha, if you don't interfere, it will be with the baron's son + the baron himself + the card player... here's the ratio of scenes... The same goes for Kate, if you DON'T interfere, she will become quite the slut (best friend + Thomas + old friends and guards)... so the ratio of scenes is about 1 to 3 +-...
In essence, the NTR route is much more interesting. The Love route is hardcore difficulty
because a WRONG move can lead to FAILURE in future and trigger the NTR route. For example, with Penny, when her husband returns, you have a choice of which doctor to call (Katerina OR Lusius). If you call Lusius and sell him the "potion," then if she brings in few supplies, he will start testing the potion on her... -_-