Sex scenes

Related to this post, but not actually about that. I am working on a magic system outlined in here, which works by calling forth magical spirits instead of casting the spells, and I was thinking on the incubus-like nature of ifrits. I don't know about how often do sexual themes or scenes appear in your games. Its not something I bring to the table on purpose (or so I think), but feel that sometimes they appear on their own and I have to work to circunvent them. From D&D, B/X: Nixies are 3' tall water sprites. They look like small beautiful women, and their skin is light blue, green, or gray-green. They avoid combat, but may try to charm an adventurer. Ten nixies can cast one such charm, and if a save vs. Spells is not made, the victim will enter the water and serve the nixies for a year. (Each nixie can cast a water breathing spell on her slave, but this must be renewed every day.)If forced to fight, nixies use small tridents (treat as spears) and daggers, and each will summon a giant…