>>282040951 (OP)
Yes. She freaks out at seeing dick pills, of COURSE she's a virgin. If she wasn't, Gojo would have been dicked down immediately last season. A non-virgin Marin by the session with her riding his dick in the hotel for sure would have fucked him right then and there, just popped his dick out and slid her bikini to the side and gone to town. Instead she got all embarrassed and pulled away. That's inexperience right there. A non-virgin would have initiated way earlier, especially given she got the feels real fast.
Plus early on we were shown all the Chad's hitting on her alienating her by shitting on anime, turning her into an ice queen. So any Chad who had a chance fucked it up unintentionally by just being a standard normie. And since all of her cosplay friends are female-minded, she had no-one around her who could fuck her.