One member of our group has a tendency to motivate us to wipe his villains off the face of the map by making them disgusting sexual predators who do things like kidnaping small children and magically mucking with their brains to turn them into s/m sex slaves who will be grow up to be his fanatically loyal bodyguard. This puts us in awkward situations as we don't want to hurt any of the victims, who are universally used as human shields. We kill those villains really hard and then have to tie up a lot of resources rehabilitating the victims. We also have a problem with the loot, as a lot of it is kinky in ways that our characters don't find attractive at all.
In my campaign, a recurring problem is that the duergar have undertaken an imperialist campaign of expansion which involves conquering Group A, enslaving its members, and using them as cannon fodder in conquering Group B, which is in turn enslaved to go after Group C and so on, theoretically until the duergar rule the world. When they conquer a CE group, like an orc tribe, they motivate the orcs with rewards based on individual desires, and thus arose the champion rogue Shagrat Paladinkiller, a sexual sadist whose reward was a harem but whose true love was an intelligent sword with an, um, peculiarly-shaped hilt. When he sneak-attacked somebody with it, you really don't wanna know the effect. My players certainly didn't! It was forged by a succubus, did vile damage, and was of an infernal metal that resisted normal means of destroying it. The PCs helped the harem escape, killed Shagrat (who came back as a ghost bound to the sword), and destroyed the sword by arranging for it to be dropped from a tremendous height sufficient to overcome the DR.
More cheerfully, I decided that the White Forest, the society where the PCs originate, is a frontier area with an easygoing attitude toward many things that the more settled areas are uptight about - the idea being that you're more likely to move into the wilderness if you feel constrained where you are. The closest thing to a central authority is the Ecumenical Monastery of Benevolent Doctrines, where good and neutral clerics gather, providing hospitality, a library, and a paladin training school. Priests routinely marry. The library contains two copies of the popular "Marriage Booke," which is chock-full of medical advice on fertility, birth control, gynecology, and erectile dysfunction, and access is not restricted (though all the books are chained to the shelves - that's just common sense). The young paladins are forever pairing up in the way teen-agers do, many of them in same-sex couples. A male nonpaladin PC has been dating a male instructor. Theologically, the Monastery takes the attitude that the genders assigned to the gods are symbolic representations only - it's obviously ridiculous to think that Yondalla gets a period or Pelor pees standing up! The idea of gender duality among the gods is so ingrained that most people in the White Forest assume that St. Cuthbert was gay when he was alive, because this image fits their notions of godhood better.
So when I decided to take the PCs to Elsir Vale for Red Hand of Doom, and realized how well Lady Kaal in that module fits the background I had invented for the instructor who's dating the PC, I made Elsir into a 1950s-style repressed society, where people do everything that people normally do, but lie and lie and lie about it.
This enabled me to give the player of the gay PC lots of opportunity for drama, because his boyfriend ran away from the Vale years ago specifically to keep his mother, Lady Kaal, from marrying him to some innocent well-connected girl for political reasons. He tried to get his then-boyfriend, Lars Ulverth, to run away with him, but Lars had just achieved his ambition of joining the Lions of Brindol and wouldn't. Now Lady Kaal has tracked the instructor down and is blackmailing him into returning by threatening to expose Lars's current relationship with another Lion. The instructor, who is a lot older than the PC, tried to keep him away from the Vale without telling him the full truth (protecting him donchaknow), causing a major ruction in their relationship, and we're now poised for all the scenery chewing you could want. The Horde is bearing down on the town, Lars's boyfriend died protecting a refugee caravan that the instructor was escorting (Lars basically looked up from his present lover's fresh corpse to meet the eyes of his first boyfriend), the instructor is subverting his mother's attempts to control him by turning up the flame and prancing around town letting people gaybash him, and the PCs have just ridden into Brindol preceded by their reputation, with the bard singing their great deeds. We're poised for a sex-and-violence drama of miniseries proportions - and a family emergency may force the relevant PC to move before we can play it out! Alas for art when real life intervenes.