You can easily farm statistics if you play for a certain amount of time. If someone wants to be able to directly "tweak" the values. Don't worry about this.
The heroine had vaginal sex more than 15 times (alcohol + save / load), the heroine is not a virgin but "Vagina: Virginal" (Screenshot Below). The variables in which sex statistics should go do not change when certain sexual acts are performed, you can only change the values of the statistics variables directly (for example, the cheat menu).
It seemed to me that it looks like bugs, so I'm writing.
Now questions.
Sex statistics ("Cum ml. In ...") will show up somewhere? Will there be changes in the heroine's portrait at different values?
Pregnancy is not yet realized?
Is prostitution realized at the moment?