Is Rei a virgin or did she lose it with Hisashi?

so i might be able to give you a vague idea of whats going on ,but this doesnt prove anything .

so basically at the begining of the anime we see that saya saying to talashi that the achool semester has just begun , in japan the school first semester is from april-july which means its still april when the apocalypse started , and rei started dating hisashi after she felt takshi had abandoned her after she repeated her grade which simply a fact that rei cant know that she is repeating grade unsell the end of school year which is usually middle of march ,e.g. march, 17 . and now if she and hisashi were to date they need to know eachother very well , tho they knew eachother thru takashi they originally strated spending time after takashi ignored her which is even shown in the anime that it happened after the start of new semester or maybe during the end of school year as they both were in school dress , i take it that she still liked takashi from the scene in the train line which indicates rei and hisashi just started dating, which means they started dating atleast weeks claiming months is bit too extreme but not entirely impossible , and lets shift to the rooftop scene if the relationship was just dating and liking eachother and if she still had feelings for takashi she wouldn't have said dying is better than living like this, i mean when you think about it she just took a 180 turn from hating takashi to loving him in a split second , and if she was afraid of dying then why would she claim and act as if its ok if she was bitten by hisashi and died , believe it or not she did like hisashi and its not entirely impossible to have had sex from how much she was devastated and had physical contact with him , its anime you have to remember so even a little hint is the actual thing , and the state ment from author that he would end up takashi with saeko indicates that rei either facked it all to survive and get revenge on takashi for killing hisashi or she just wasnt a vergin anymore , theres point that indicates she is still virgin and some point strongly indicates she wasn't , japan is a homogenous country with really strange dating culture but japan has strong culture about girls being vergin till marriage but these days highschool girls tends to loose it , it means if they had boyfriend its safe to asume theya rent vergin anymore , but again hisashi isnt that kind of guy to just do it with her after dating few weeks but he is still a guy and every giy flips when they are in mood , it is really hard to say but as rei aand hisashi did like eachother and was already in a relationship and the way she acted around him is strongly possible for her not be a vergin , takashi never touched her and that is so obvious cuz they were never in a relationship , theres one more thing i wanan add during the escape to the roof when they first encountered the teacher zombie rei said she is the vice president of martial arts club and hisashi was black belt in karate , they had plenty of time after school to have sex in a month but the fact that they had to know eachother well to start dating is still a huge factor in when they started dating , as i said it was the starting of first semester which means it is most likely still april or early may and the final evaluation is done in march so she got to know she is repeating aa grade during march following her despare and takashi's lack of notice to her let her to spent more time with hisashi and dating him , it is safe to assume hisashi was a replacement of takashi for her at the time , so was takashi , what she needed was attention and someone to support her , i cant tell with full confident that she is still a vergin or not cuz theres so many factors that contradicts eachother, but if we think of a scenario where hisashi wasnt bit and takashi was ready to leave to smash the zombies downstairs what would her reaction be then , would she still react the same or would she accept it as hisashi is still with her ? it is very clear that she had mixed feelings and conflicts within her about her romantic interest , she doesnt know herself wheather it is takashi or hisashi that she likes, i dont think she would've cared much about takashi if hisashi was still alive and hisashi is calm collective and more of a leader then takashi when it comes to making decission, if he was still alive he might have been the main character not takashi, even tho i want to believe rei is still a vergin and everything she said is the truth i still cant shake the feeling that it's all just a made up thing , she could've lost her virginity with hisashi as in japan if you have a boyfriend then you have lost it most the times , but the short time period of their relationship is still a huge factor as why she could still be a vergin. if the story continued we could've had lots of insight on every doubt we had but it is very unfortunate that the author died.