Evolution certainly would "create" men with the capacity to end up gay, just as it obviously has not only 'created' humans with such a capacity but other species as well up and down the phylogenetic hierarchy. That appears especially true of species at the highest orders of intelligence (primates, pinnipeds, porpoises, pachyderms - hmm, there seems to be an exceedingly strange p correlation ;) while the 'lower' phyla tend to have much fuzzier sex-type boundaries to begin with.
The far more intriguing question to ask yourself is why an intelligent designer would "create" something that he allegedly abhors.
"gay"-ness is not a matter of evolution or creation. It is a matter of choice. People can choose to be gay and not to be. To the extent that they become disenchanted - they can again change their minds and choose not to be gay. There has been an attempt among pro gay scientists to pass off any hint of something that can be colored as "gay"-ness in nature as animals in homosexual relationships. The pursuit for what I've seen from it is so disengenuous that some people should be held to account for fraud.