If sex can be used to sell cars, then what about bicycles?  

Exersise sure leads to a sexier body.  I once heard one car commercial say "the shape you want to be in."  Doesn't that make more sense as a bike commercial?  Your body, rather than the car, can be the shape you want to be in.

Bicyclists with "just married" signs, in 2003 Vancouver pride parade as Canada debates gay marriage.

See also:
Banners on Davie Street.