If I may, while I have no issues with prostitution in a game (I don't have much actually with real-life prostitution, the main problems being the protection and free will of the prostitutes), I can see how it can become a turn-off for some people.Currently I have no plans to make 2 separates paths, simply because I don't see the point of it.
The goal of the game is corruption after all.
I mean you can always decide not to go work, but that would halt progress of the game at some point.
However, there are ways to circumvent this without having to offer an "innocent" path. And, frankly, the easiest is to remove the money issue, especially as presented as a money issue. You can note that tobigoku had no problem with how far May went with the biology classes, despite their being motivated by the tuition costs. So, in my opinion, it would be easy to have the school director request May participate in some swinger/orgy events, where she would discover she likes what she does and decide to continue even after the director tells her her tuition costs are completely covered. You could have a corruption path within this situation as she would be involved in kinkier and kinkier parties.
You could probably imagine many other ways to create a similar narrative where May does not have sex with strangers for money, but only because she wants to (in fact, I can even imagine a combined storyline between the school, the contest and the strip-club, and even elements from some of the other job storylines...).