Domains registered with this registrar and caught in spam traps usually redirect to a Japanese R18 dating site at admens.jp
It comes in spam as a link to this redirection site, for example
Click on the link and you get redirected thus:
Sponsoring Registrar: GMO Internet, Inc. doing business as Onamae.com
RSS.URIBL.COM listing shows
RSS Feed: Listed Domains registered at GMO INTERNET, INC. D/B/A ONAMAE.COM AND DISCOUNT-DOMAIN.COM
62.8% - 184 of 293 domains registered are listed by URIBL in the 5 day period (June 2011)
Registrant Name:Whois Protect Service
Registrant Organization:GMO Internet Inc.
Spammed URLs look like this
The admens.jp web site is in Japanese and English, and the featured brand is "Make Love"
The base of the web page has "Copyright MakeLove All Rights Reserved"
The domain cityheaven.net, registered through GMO INTERNET, INC. D/B/A ONAMAE.COM AND DISCOUNT-DOMAIN.COM is listed on at least two SPAM blacklists as of today. This does not necessarily indicate that they are guilty of sending SPAM, merely that the server that their IP address is associated to was confirmed by at least 2 sources to be a gateway for SPAM. This leads us to recommend caution on this server as it is possible that if it is compromised for SPAM, other data could be compromised.