Yes, I understand what you mean, but I never heard about putting drugs in drinks in Spain. If it happens, it must be a real unusual case, no more frequent than anywere else.
About the drinks, I never take those precautions, and neither do my friends, male or female, and I never saw them drugged that way, the only thing we have suffered recently in some places with are some new customs brought from other countries: If you leave your drink unnatended sometimes you find it ... empty! Which is nasty but not so dangerous.