There's already intercourse in the fantasies. I don't see any point on keeping the MC virgin, even the no-condom argument is ridiculous, he can always just pull out.
ffs
Edit:
the one dimensional females who (auto) fall in love (on day one) w/ MC is already making this series lame
This purity thing is just making the MC lamer
Well, considering there's not much story and plot, I guess it's one of it's few hooks to keep readers around. Maybe.
Although this MC is supposed to be super cool and strong, the author needs to learn how to introduce his MC like the Solo Leveling MC(no harem, but author did a good job of expressing how OP his character is) or One Punch Man.