The looks don't matter- ASMR is triggered by sounds. Yea, many popular channels feature hot girls, but that actually has little to do with ASMR itself. Heck, Bob Ross is one of the most famous ASMR triggers. The stimulation isn't in your genitals or anything like that, it is in your scalp, and can go down your spine, and it isn't erotic, its a relaxing, calming sensation. Those who have ASMR know it isn't sexual. I suppose it is impossible for those who don't get it to understand, and some YouTube channels dedicated to it don't help due to the appearance of some of the women in the videos.