I have a theory. Youta ... get's dumber every time he fucks. That would explain a whole lot, LMAO. Think about it. When the manga started he had average human levels of IQ but after fucking his brains out he's LITERALLY dumber as a result.
Idiot didn't realize he just has to go out a window, through another building, across a jumping puzzle, and in through another window to get inside the room.
On a more serious note, does it actually just kill the virgin?
Neither. It's a translation error. The original raw says "でもあんたのそういうウソがつけないところ嫌いじゃないよ" which, when properly translated, actually says "But I don't dislike how you can never lie." Meaning that it was in fact telling them the truth.