I am not sure if this fits into celebrities that went into porn, or if it can stay here, but it is a notable title nonetheless:
SDMU-951 Genuine Mahjong Pro Nakanishi South Congratulations & Bukkake Simultaneous Ban (simultaneous Ban Of Ruby: Double Reach)
Women's Professional League (Women's Sakuraka) Report Card
Article about debut title SDMU-939
Mahjongg Blog Link with Pics
Yahoo Japan Link - Real Name is Nana Miura
Twitter Link for Promotional Appearance
Nana played pro mahjong and was apparently pretty decent at it. She is also good at sex with multiple partners at the same time.
I enjoyed this title (SDMU-951) because of the inclusion of mahjong and how it was worked into the theme. Nana plays a round against a few guys, apparently loses, then strips and has sex with them. This is her favorite part of the shoot.
MY favorite part is when they proceed onto a news announcer type format, where Nana is reading through an annotated mahjong game, all the while dudes are blowing solid loads on her face and suit jacket.
At one point, one of the guys hits her square in the nose and mouth with a beautiful load, and she basically breaks down crying. It is hilarious. That's a wrap!
I wish I could understand the dialogue, but regardless, it is a fantastic title. I have yet to see 939 but it looks solid as well based on Nana's performance in 951 as well as the shared theme.