I thought of that too, but if the events have consequences, tie the progress to the event, not the leveling system. There's also nothing to say a character's development has to be tied to the storyline (In case you're not aware, they have quests for characters but also a main storyline. Quests are things like, "get Rogue's love and trust up to 725" or something like that. Main storylines are actual plot. Like hate crime happens or Juggernaut attacks). The game as it is now, you can't even take off take off their bra until like chapter 2, after a sentinel attack. Like, what about your friends getting killed by sentinels have anything to do with how a girl feels about you? On the other hand (in the game, after plot, you usually get some new powers because of plot), if things only change between you and a girl because you've gotten new powers(forced upon you, might I add. Like these powers happen whether or not you level at all) or you get hurt, that kinda says the girls only love you because of power or sympathy. Which...yeah, kinda says you shouldn't with these girls. Like no amount of reassuring from Rogue will convince you otherwise (this is an actual plot point in the game. Rogue says she doesn't fall for you because of your powers repeatedly.)
I can see that. Though, for me, their powers should add spice to the whole sex thing. I like that Kitty in RLE can steal people's clothing. I would like it if there were more things like that. Well, beyond blackmailing/handling Prof. X.