Some find this a barrier to join, fans say it weeds out the casual chancer from those truly looking for love – and means you don’t have to wait to broach tricky topics.

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A one step Facebook log-in process leads on to a few simple questions (the most obvious – height, kids, whether you drink or smoke), a description and a photo – then you are in. To use the site fully – sending unlimited messages to other members – payment is required.

You can browse a selection of pictures and ages before logging in, anything more specific requires you to become a member. As with many free or low-cost sites, ads can be frequent and feel spammy.

The price and process mean only the dedicated remain – but equally, can lead to people dropping out mid-process.

Controversy swirled in 2010 around its lack of same-sex matching resulting in a site launched later for gay and bisexual daters called Compatible Partners, but e Harmony now offers matching for both mixed and same sex couples from the main homepage.

But too many filters and rigid check-boxes can have you dismiss huge numbers of people at once – something that apps like Bumble, Happn and Tinder tried to do away with (though that brings its own set of issues).

One 5ft 10in friend reports she saw only 400 potential men to browse when she logged in to Cons: The lengthy survey you must complete before you sign up.It is 100s of questions long and asks many probing questions about religion and moral views.Pros: Free to join and to have limited contact with members.You can connect with Facebook so getting started is much quicker than with other sites.Yet many friends of mine who had previously ruled out anyone with children on a dating site are now happily dating (or married to) single parents they met in real life.