the dutch are a tolerant people. confront them with all manner of "alternative" behaviour and they will say: "whyever not?"
(i do not always agree with this philosophy, i must confess. i mutter, for instance, on the early-morning train, sleepy, mellow, and seated next to an idiot with his walkman at guaranteed-deafness-level: "whyEVER?")
but do not slide unsolicited advertising into their mailboxes: it is unacceptable, and they will not be pleased.