In one class with a male professor, I wrote a sentence involving a general example and I used 'his.' My prof commented that I "should be more gender-neutral."
Then, in a class with a female professor, I write a sentence using "his or her," and the prof accuses me of using such vague prefixes because I'm "trying to pad the word count."
Moral of the story: political correctness stinks.
"When this bogus term alternative rock was being thrown at every '70s retro rehash folk group, we were challenging people to new sonic ideas. If some little snotty anarchist with an Apple Mac and an attitude thinks he invented dance music and the big rock group is coming into his territory, [that's] ridiculous." - Bono, 1997
The English language lacks gender-neutral pronouns, except in the sense that male pronouns are used for objects of indeterminate gender. I don't really have a problem with this, but I have started using Spivak pronouns anyway.
Unfortunately, scientists have become like expert witnesses: in theory the idea is good, but in practice with enough money you can find someone who is willing to reach the conclusion that you want them to. It makes it hard to know who you can trust.