"Monthly membership" refers to a recurring payment that you make each month to gain access to certain benefits or services provided by a particular organization or business.
Single black men seeking Latin girls can also use the Latino mail order bride sites but they have to pay for monthly membership fee. (mexicandatingo.com)
You don't have to search for big main dating sites that are advertised on TV and pay for monthly membership fee. (asiandatenet.com)
So, some of them prefer to pay monthly membership fee at paid dating services. (adatingnest.com)