Verb (used with object) : a campaign to desex business writing.    From Dictionary.com. 

I wasn't going to hide away and desex myself after surgery.    From Wordnik.com.  [personal « WordPress.com Tag Feed] Reference

People needed to desex their dogs to stop this from happening again, Ms Bradley said.    From Wordnik.com.  [Stuff.co.nz - Stuff] Reference

CAT owners are being urged to desex their pets as the RSPCA NSW euthanases dozens of unwanted kittens daily.    From Wordnik.com.  [northernstar.com.au: The Northern Star] Reference

It is advisable to desex your cats before 6 months to prevent this from happening. http://www. cat-world.com.au/CatMyths. htm.    From Wordnik.com.  [Cats On Tuesday: I am Scofield and I am fabulous!] Reference