She also disclosed her 4 taboos in her AV career. No anal, no raw sex (no condom), no internal ejaculation (obvious go with no raw) and no lesbian. Which is a bit curious, compared to other idols. No anal is common enough for JAV. No creampie, I always thought is more about pretended modesty, but it seems Akiho takes it seriously and sincerely. Even to the extent of no raw penetration, which is relatively extreme, IMHO. And no lesbian sex... all I want to say is: curious.
Playno1 took the trouble to bring up her 2015 vid titled "Creampie something something" which is now definitely confirmed as fake. Personally I am curious did she perform raw oral and take ejaculation on her face and in her mouth? Assuming she did, then her red line (pun intended) is really her vagina, or womb, it seems her psyche is focussed on her womb.
This is pretty common. There are a lot of reasons, each woman has different ones.
Some think of it as not really intimate sex if there is a condom, a barrier between them and the guy. It also means they can hold something back, they haven't given over everything to porn. I think some of the fans like that too, they can dream that Akky would fall in love with them and let them have raw sex with her.
Some are just really scared of pregnancy and don't trust other forms of contraception, or what to use condoms and pills and rhythm to be extra safe. Some just find cum a bit icky and don't want it in them.
Then you have the other extreme, the ones who prefer creampies. Maybe because of how it feels but I think actually it's mostly down to not getting cum all over their face and in their hair. Much easier to clean up nakadashi.
Akky did real oral creampie but never swalled, or at least no more than she could avoid accidentally. The "creampie" video was never sold as actual nakadashi, it was one of a series where they have sex with a condom, the guy cums insider her (in the condom) and then they let the mixture of lube and vaginal fluid drip out. I guess it was supposed to be like pseudo nakadashi but it didn't last long, I think there were only 2-3 videos.
Yuma Asami did something similar, condums but the guy cums inside her. It was a pretty good video actually, felt intimate and a bit different since she also never did nakadashi.
I kinda like that it's a thing some girls won't do, or at least need a while to build up to. Makes it more special.