I don’t know why the Belgians should be most prone to this, but according to this campaign that is how it is. Undoubtedly alluding more or less subtly to sex (usually in the form of pretty women) sells wine, as well as many other things. (You could probably even sell paper clips with it.)
Sometimes it is outrageously trite or tasteless. Sometimes it is fun, humorous or even self-depreciating or ironic. Sometimes it is, well, incomprehensible.
Which of those categories do you think this video campaign for cava belongs to?: Sex in wine advertising: drink cava, make more babies?