Only one, but the light bulb really has to want to change.
A: None: A 'Real Woman' would have plenty of Real Men around to do it.
Tell it to change its socsks!
None. The light bulb shall never burn out. (OK. It's more cathartic than funny...)
Five: One to do it and four to tell you how they did it on the last job.
One, but only if the lightbulb really to change.
A psychiatric tryst.