At least for votes, ff beats mm by miles and miles. FM is good, and all the permutations that included F or f and m or M. You could set up a table of six, or more options and roll a dice. With twelve options roll two dice, or with the first die odd is start at the top of the list and even is start at the bottom. The second die roll decides how far down or up the list you go.
Options include one or more of the BDSM triplet. Bondage, with or without discipline, Domination with submission or with submission resisted, and Sadism and/or Masochism. Pain sluts are popular, guys into pain a little less. Either sex can try to be dominant, or taking turns can start a story.
The classic boy meets girl and normally boy loses girl and then gets her. The switch is girl meets girl, etc. Do-Overs are popular. Ones with a sex change have been done, but not to death.
Naked in School probably would need a twist, maybe from a teacher's point of view, particularly if the female teacher needs to take her clothing off. Male domination universe females as sex objects/slaves. Or other way around, XX dominates XY.
Thinking Horndog has an interesting universe, Swarm Cycle, where aliens are on the way to conquer earth and some people can leave to establish colonies, become infantry or space naval personnel, and low scoring takers of the test are sex slaves, the higher the CAP score, the more concubines can be taken by high scorers.
Look through the various SOL Universes, there are some that could be adapted to new stories. The Damsel In Distress universe has perhaps a dozen stories. A little complicated but a good reason to have lots of sex and a trip to the equivalent of medieval times.
There are a whole bunch of "ideas" for stories in one section of this form. I like my Halloween one, where the boy comes to the door dressed like Roy Rodgers and says Trigger Treat. (Roy's horse was named Trigger.) Well, it sounded funnier in my head than on paper.
Story ideas are everywhere, even in the news. Donald Trump kidnaps Hillary and tries to have his way with her. Resistance and perhaps humor ensue. If her husband preferred blow jobs from interns, perhaps she isn't the most convincing sex object.
Marilyn Monroe meets Harry Rheems (the 14 inch guy) and one of the gags was nude Marilyn didn't have nothing on, she had the radio on. Perhaps more current personalities would do better for today's SOL readers. Not all of us are 71 and counting.
Its not getting ideas, you probably have at least a dozen plausible prospects. Just look at the SOL tags. Doesn't Science Fiction or Needles suggest something? Look at some porn. Drink something alcoholic. Watch some movies or television. There are stories everywhere. Steal one and live long and prosper. Star Trek fan fiction, anyone