Then It will become much sweeter when that bastard got trolled hard by healthcliff
According to an interview written in the infamous 16.5 (16.5 actually contain 6 chapters and 3 interviews decided through popularity vote) they did in RL too and in ALO too.
Yui 16.5 interview:
Spoiler for Yui 16.5 interview::
Interview: Do you watch your parent make love with each other?
Yui: during the SAO era, I only stay for 2 night so they didn't do it but I do see them make love in ALO
Interview: what do you think, is it erotic ?
Yui: please ask lizbet-san about it
the other interview are pretty easy to understand mostly if you google translate, most of the interviews (Asuna and Kazuto) are about what they usually do on their date and some sensitive question about their sensitive body part and asuna favorited underwear color
Talking about 16.5 there are six parts:
1_the actual 16.5
2_yuri stuff between 2 lord in ALO
3_yuri stuff between 2 lord in ALO (real)
4_ecchi stuff with Lizbet as main heroine
5_echhi stuff with the nurse in the hospital ("kazuto-kun is really good with ecchi stuff ne")
6_Tentacle with Asuna - from volume 3 or 4 when she got discovered by ... tentacle avatar
I will try to translate the interview to check on my Jap skills since I last looked at them 6 months ago