Here's an interview with the producer, or chief developer, or whatever, of Dead or Alive Extreme Beach Volleyball. This gives you some insight as to the people behind all the Japanese shit we're addicted to.

On a side note, Tomonobu Itagaki makes mention of how showing young girls in manga, anime, games, and such is perfectly acceptable over there, since you're considered an adult at 16, at least by tradition. I'm telling, you, I am so fucking going to Japan - and never coming back.