FreakyJapan – a place where we fuck eels!Sex, Madness and Pure Fun!

Tamakeri (lit. ball kicking) is a sexual fetish and subgenre of pornography in Japan. In tamakeri pornography, a female kicks a man in the testicles. Some tamakeri fetishists report that they prefer to witness kicks that resound with a hearty slap. Pornographic tamakeri videos cater to masochistic men for whom the idea of getting their testicles kicked is sexually stimulating, at least in fantasy.
Erika Nagai is among the many AV performers who work in this kind of fetish.

(Wikipedia Tamakeri entry)