******* in Japanese porn

[Nymets1236]

Is there any reason why it is so prominent over there. I mean it is hot and everything but i just notice how its typical for many of the movies to be ******* based.

 

[Nymets1236]

no one?

 

[sheath]

some say it's an ancient ritual...some say it was made for porn...
http://en.wikipedia.org/wiki/*******

 

[Nymets1236]

thanks