Board Thread:Questions and Answers/@comment-98.95.22.178-20140731191307/@comment-32404174-20170712045352

Its not implied that they had sex in the anime. To explain, Kirito asked if he could spend the night with her at her house in selmberg. She agreed. Sometime inbetween then and the end of dinner, she must have thought he wished to have intercourse. Probably not wanting to seem like an ebarased mess, she went along with it, and proceded to undress before him, getting down to her undergarmets. Surprised, he explains to her that he only wished to sleep with her in the same bed, and not "the other thing..." Angered, Asuna punches him. In the light novels, the game stops her, but in the anime, its unsure if the effect took place.