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This model also allows users to switch between free and paying status at will, with sites accepting a variety of online currencies and payment options.

Most free dating websites depend on advertising revenue, using tools such as Google Ad Sense and affiliate marketing.

Women with sexist attitudes towards members of their own gender were more responsive to aggressive men - suggesting they find men who treat them in a dominant way more desirable because it is consistent with their sexist ideology.

Dr Jeffrey Hall and Dr Melanie Canterberry, of Kansas University, said: 'Our results suggest assertive courtship strategies are a form of mutual identification of similarly sexist attitudes shared between courtship partners.

There are mixed opinions regarding the safety of online dating.

Over 50% of research participants in a 2011 study did not view online dating as a dangerous activity, whereas 43% thought that online dating involved risk.

In 2008, a variation of the online dating model emerged in the form of introduction sites, where members have to search and contact other members, who introduce them to other members whom they deem compatible.

Introduction sites differ from the traditional online dating model, and attracted a large number of users and significant investor interest.

Online dating services allow users to become "members" by creating a profile and uploading personal information including (but not limited to) age, gender, sexual orientation, location, and appearance.

Most services also encourage members to add photos or videos to their profile.