Ref. 4:
This reference is in Swedish and is from the RFSL website.  It discuses the use and recommendations of many illegal drugs.  Fo r example, about Ecstasy (translated into your language) it reads in part:

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Ecstasy evokes feelings of strong euphoria (vigor, well-being and high spirits) and feelings of love.  You can become more sensual but it does not give you better erection… Precaution: Drink water regularly but not more than half a liter every hour.

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For a look at the original text in Swedish click here (file size: 104 k)