Relatieplanet.nl: the oldest Dutch dating site. There are many dating sites on the worldwide web, but not all of them offer the same quality. With Relatieplanet.nl you make a good choice when it comes to the number of members. It’s one of the dating sites mentioned. What’s more, Relatieplanet.nl is one of the largest Dutch dating sites in the Netherlands and Belgium. Also interesting to note is that Relatieplanet.nl is the oldest dating site in the Netherlands. It was founded in 2002 and has been a great success ever since. Not a surprise, since the navigation is excellent and you can easily get in touch with other singles. This is also because of the fact that everyone is welcome on Relatieplanet.nl, regardless your age, sexual orientation and so on.