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Medical specialists say drinking as little as 25ml of methanol can be fatal, but it is sometimes added to drinks because it is cheaper than alcohol.

In the study, alcohol, and particularly methanol, increased the males' production and release of chemical sex signals, called pheromones, which made them more attractive to females.

The father of 19-year-old Holly Bowles, who died of suspected methanol poisoning in Laos last month, has said he was in "disbelief" when he realised his daughter would not pull through.

The incident comes weeks after the deaths of six tourists in the South East Asian nation of Laos because of suspected methanol poisoning.

This hybrid catalyst performs a two-step reaction in which zeolite converts methane to methanol, and then the enzyme converts methanol to formaldehyde.