[Nyororin]

One of the biggest issues with barring foreigners (All those "no foreigners allowed" etc signs) is the mistaken impression of all those soaplands etc.
To put it simply - they`re not for having sex, and penetration is a serious violation of the rules... You penetrate the girl, and it`s rape right then and there. If the shop decides to let it go, they lose their license to operate along with huge fines should the word ever get out.

So they`re all "foreplay". A lot (most?) of the foreign guys who decide to visit these places take them as brothels when they`re really not. The girls aren`t prostitutes, and I`ve even heard of "virgin" girls working in them.

The massage thing isn`t a loophole, really. As long as penetration is not involved it`s perfectly legal.