While reading the 50 Shades.. prompt I got to thinking about ways that you could potentially use it with regards to 50 Shades of Lois. My favorite personal idea was 50 costumes. How many has she worn in canon? If there's isn't 50 (likely there isn't) you could imagine all the ways that there might be more adult ones that Clark and Lois might have used in the bedroom.

Well, there's the harem outfit for starters.

1. Harem outfit. (PML)
2. Nurse outfit (Ordinary People)
3. Pregnant lady (Target: Jimmy Olsen)
4. Chicken outfit (I've Got a Crush On You)
5. Tough Girl (Wall of Sound)

6. Man (Pilot episode)
7. Man (Chi of Steel)
8. Concubine (Lord of the Flies). Admittedly, it is debatable whether this should be considered a costume
9. Ultra Woman (three guesses which episode). Ditto.

Joy,
Lynn

10. Painter (Resurrection)
11. Inmate (PvLL, DLW)
12. Military person (Operation Blackout)

13. Space shuttle crew member (Pilot)

14 Bride (Honeymoon in Metropolis)
15 Lady Loisette (Soul Mates). Again, debatable whether being in one's own former body counts as a disguise.
16 Lulu (Soul Mates). Ditto
17 Wigged lady (Dead Lois Walking)

18. Copier Repair Person (The Source)

19. Patient (with basketball baby) in the one where Jimmy is turned into an assassin (forgot the ep name)
20. Spike's sister (I forgot the name of this one too but it was close to Clark and Lois's first date).

I also think you could conceivably argue that Lois is putting on a "costume" when she goes on the interview with Luthor and has a meal/date planned with "Superman" from Season one.

We already have the pregnant woman in TJO. I think Spike's sister might have been Angel.

20. Ghost/zombie/dead person (Ghosts)

21. Waitress outfit (I've Got a Crush on You)

22. Bond girl (Don't Tug on Superman's Cape)

23. Lucy from "I love Lucy" (Don't Tug on Superman's Cape)

24. Mental ward patient (The ARGH!)
25. Wanda Detroit (The ARGH!)

26. Bride (for their fake wedding) - StGTTWNK

and since grasping at straws is allowed...

27. Woody Samms - IGYUMS

28. Alt-Lois - Tempus, Anyone?

Doesn't Lois dress up as Superman in... Clark nightmare in S1's ILTY? 29. Super-Lois? - ILTY.

IGYUMS? I don't remember which one that one is.

I'm going to count how Lois dresses for the Clone-Superman for this (as I think she was playing to expectations with both Luthor and Superman).

30. Luthor "date" (variety of eps from Season 1)
31. Lois dressed as clone-Superman's date (forgot the ep)

Does the lookalike count?
If it does, then 32 is the lookalike from Madame Ex

It can. We're looking for ANY possibility so reaching for ideas count.