Colossians said:
And the question is:
"Given your supposition that utility (specifically preservation) is that which drives evolution, how is it that man's higher-developed functions (specifically the intellect) are responsible for sexual dysfunction (inability to [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse]) in the male?"
Were I to guess, I'd say that it is because male human tendancies lead to sexual stimulation in the abstract. Man sees a picture of a naked female and he becomes aroused, he sees a woman on the street and he becomes aroused, in fact, being both human and male, he sees linoleum and he becomes aroused.
The arousal isn't based on any real physical interaction, but on a mental one. Humans, having reached a point wherethey are capable of distinguishing themselves from their surroundings, are removed from their surroundings, the interactions that, among other species, are based on a physical attribute, (pheromones, seem to be popular) take place, entirely, inside the mind of the male human. If that mind is damaged, in some way, or malfunctioning, then that connection can be circumvented.
As for the reason for it evolving that way? Well the ability to seperate ourselves from the rest of the universe is part of what gives the illusion of awareness. This seems to be a side effect of the human brains operation, this has, in itself, aided our survival, (since we're not exactly physically superior to the rest of the creatures on this planet) allowing us to suceed as a species. The disadvantage of this human survival technique is, however, that higher levels of complexity in the brain may lead to other disadvantages and possibly a greater chance of a malfunction. This hasn't, however, proved to be a trait that reduced our survivability as a species. (though it may harm the individual, evolution doesn't care about individuals, only populations).
Does that work? Since it isn't really my field, I could be way off, but I suspect you're not actually looking for an answer, given the title of the thread. But, since I am an evolutionist, and I have answered the question, (even if that answer does not satisfy you) would it be fair to say the thread is mistitled?
Perhaps, "Another question the Evolutionists can't answer to my satisfaction."