Now the popular cute face, big tits idol Sora Aoi/Sola Aoi has a new blog, and it can do auto-translation for English, Chinese, and Korean, although the quality of the translation is far from perfect:
Aoi Sora / Aoi Sola Official Blog
http://aoisola.cocolog-nifty.com/blog/
Yeah, especially popular ones seem to be what's called "school swimsuit" (スクール水着, or スク水 for short) titles, and it's popular in the same way that school uniform titles are popular; girls wear only for a particular period of time.
Yea, especially debut videos, and they normally have an extensive interview (on topics like what kind of guys attract them, their abnormal sex experiences, etc) in the beginning.