worth a try

When I lived in Japan 5 years ago, (adult friendfinder is one of the oldest websites for online dating) I joined the site and I met with 20 girls and succeeded score with 19 girls for 1 and 1/2 years. 95% success rate.
They were all horny sex-desperate girls who wanted to have uninhibited/wild/wet fun. dam I miss my life in Tokyo. If my memory serves me right, let me refresh my memory here, 9 japanese, 1 canadian, 5 americans, 2 french, 1 chinese, 1 jamaican.
Adultfriendfinder also operates asianfriendfinder.com, chinesefriendfinder.com and koreanfriendfinder.com. Never tried adultfriendfinder in north america after I left Japan. SO I don't know how it helps you score here.
I also used lavalife.com as well. The quality of women is way higher at lavalife.com. (I am very very picky about looks.) I used lavalife.com when I was in LA and the success rate is about the same as adultfriend. they have three categories. Try horny girls in the category of intimate relationship.
I also tried
www.ashelymadison.com to check out desperate housewives. It sucks. Don't even think about this site. They fabricate some of their DB according to my investigation.
FYI, lavalife is a Toronto based Canadian company which has more data base of canadian girls. adultfriendfinder is an american company.
Overall, I recommend adultfriendfinder or lavalife strongly. Never tried grapevine and not interested.