In September 2008, the Sperm were invited to visit sunny Barcelona...

where men apparently suffer from a low sperm count — as the Guardian recently reported :

Spanish study links city life to low sperm count

Young men are at risk of a low sperm count if they live in cities, according to researchers in Spain. A study of 1,239 men aged between 18 and 30 found that in built-up areas such as Valencia and Catalonia, men with low sperm counts were two to three times more common than in more rural areas, such as Andalucia and Galicia. The research, conducted at more than 60 fertility clinics, compared men from different areas whose lifestyles were similar. Marisa Lopez-Teijon, whose study appears in the journal Andrologia, said the effect could be due to environmental toxins affecting baby boys in the womb.
Ian Sample

A comparison of sperm count in various cities in around the world, including Barcelona, is available here: