Well at the very end of Part1 Inoda does say, after meeting Kirito in the morning and going back to fucking Asuna, "look how you've become out of it" or something along the lines...
I believe he will make it that either at some point during the night Asuna got simply lost in pleasure, or Inoda used some sort of drugs... I mean he used those in the game, if he could he would surely use something IRL too it feels like. And in the end Asuna will remember most of the fucking, yet not all of it... but have regrets regarding all of it.
Anyway, only will be seen when Part2 will get released and we see Asuna's POV of the night.