its definitely a problem in the states, thats just my opinion, and it may have something to do with the fact that I live on a large university campus with some 36,000 students. it happen to my friend last year, or so we think... she had only one drink, and she (and all of us for that matter), left her drink on a window sill (really commnon thing to do at this particular bar), and danced for not more than 5 minutes. she thankfully did not end up being raped because we took her home, made sure she was ok, but it was a definte scare, and other people on my campus have not been so fortunate in the past. a week doesnt go by that their isnt some advertisement warning of such things in our campus newspaper.
that said, if you spend all your time worrying, you will be miserable, i dont know if its a problem in spain, but i say take the same precautions you would anywhere else and dont be paranoid.
kelly
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"Ojos que no ven, corazón que no siente."