There’s no way in hell it was a total surprise even most of the time, I mean how else would the target of the intruding party’s affection be picked unless they had already met prior?
It seems to have been more like a previously arranged midnight rendezvous rather than a “hi random woman I don’t know, I just broke into your house, would you like to sleep with me? No? Okay I’ll move on to the next house. “
Considering these are the times where you’ll get promptly stoned to death for actions like breaking and entering or rape, as a man you’d definitely want be certain that you’re not going to be decapitated by the local Samurai for forcibly trying to woo his daughter or something.