I’d agree, Lisa, that this doesn’t seem like the greatest of ideas, but when I looked at that article it appeared only to refer to one, albeit prominent, park (for now). What’s more, there’s nothing to indicate that heterosexuals cannot join in the al fresco frolics.
On the topic of emigration from Holland, it’s important to remember that one of the reasons that a good number of the Dutch (Pim Fortuyn was the most notable example) have objected to the immigration of so many Muslims is the fear that the country will become less permissive rather than more.