Recently I was searching the information about graduate studies at Netherlands, I found out so many interesting and cute details. Here's one of them (from Dutch immigration authority, FAQ):
Do I need to be married to be able to bring my partner, or can I get a visa for my boyfriend or girlfriend as well? What if I have a partner of the same sex?
You can get a visa/residence permit for your partner even if you are not married. The partner can be of the same sex as yourself. The main criterion is that your relationship needs to be "durable and exclusive" and you must be living together.
That's really outstanding. What an open country...XD