How often do you step on the scale?

Every day; sometimes twice in the same day if I happen to walk by the scale in our warehouse.
Write the results on a small notepad on my desk.
When the page gets full of numbers -- about once a week or so -- I'll average these numbers & log it.
This avoids a sawtooth graph due to the influence of normal daily fluctuations.
Some insist on first eliminating all bodily waste and eating nothing before weighing.
Some insist on being nude.
Doesn't matter, as long as you're consistent.
Since most people wear clothing, and therefore carry it around all day, your body feels that weight; so what is the advantage of weighing naked? When I visit the doctor's office for an exam, I don't strip before weighing.
So what if you had (or not) a "Ron White" elimination ... you know, the kind that makes your pants feel better afterwards.
Weight is simply an indicator and shouldn't be your master.

I found it saved my sanity to weigh in once a week instead of every day. I get too easily discouraged watching the fluctuations when weighing every day...

I weigh daily and put it into an app called Happy Scale. That plots a 30 day and a 10 day moving average. If your 30 day moving average crosses below the 10 day, it turns red to show that you have a bad trend going. Otherwise, keep it all green and don't sweat the numbers.

In maintenance now, so I only weigh once every week or two.

I weigh every day at the same (ish) time before food & drink, then log it on MFP and use the graph to notice general trends of weight gain or loss. I weigh in lbs rather than stone (which is what most people with with in the UK) because the number in the scale doesn't equate to a "real weight" in my mind that way. Im aware this method wouldn't work with a lot of people, but as someone who suffers from intermittent water bloating, if i only tracked once a week it would be difficult to see a general trend that way.