Characters will, as a general statement, have 5 corruption levels each. This may be mixed up by characters like Jenny who has multiple different paths to travel with her predator/prey corruptions, or Lin who starts the game completely corrupted.
On top of these there are several bonuses that may unlock extra content or provide bonuses. Alex has two of these as such where the first one makes her start with 2 extra love. These love points are not required and do not grant any extra content besides a couple of altered or extra lines that reference the difference, they purely make it easier to access the content she has anyway. Because you aren't trying to play persona and fit a perfect run into the weekend, it's okay if it's easy(er). The second is a toggle for her fertility, currently this means that she may send you a message about a happy little accident if you cum inside her. This will be expanded upon as your options to impregnate her continue and it will have a secondary level where she arrives at the reunion pre-impregnated by you.
Splitting them up into separate levels allows for the exploration of what can happen if you play fast and loose with the corruption levels. When there is more room for it, the fertility unlock event will be moved into Alex at corruption Level 5, meaning that you can then go back and explore what would happen if she was... less prepared for consequences.
Also I once promised someone that pregnancy could be toggled off and this allows for that.