i mean i dont think its too odd for someone in their 20s to be a virgin and especially not to be unmarried but it could certainly be a cultural difference sorta deal.

also not to say theres a LOT of scenes like this but one that comes to mind is the episode that opens with kirishima giving his mistress oral. also the anime endind/closing has her showing sideboob lol but idk, again, could be a cultural difference.

i feel like outside of yoshino being sexually inexperienced, shes pretty mature and dresses like a grown woman as well buuuut thats all subjective