What about encounters with a succubus? It always leads to some type of "sexual" experience.
Heck, in a campaign I am playing in, a Pathfinders game, I have demons chasing my character because her mother was a celestial demon hunter of renown (my character is a Human Celestial Sorceress/Fighter multiclass) which would hunt demons in the planes and piked their heads on the end of a spear to display them to all the other demons. To make a very long winded story short (I written up a several page background story for my character), they are after the soul of the daughter of the famous demon hunter as it would be worth a ton in the hells so the demons decided to suduce my party with succubi and assault us with Ice Devils and several other dudes. It ened up with the Barbarian in our group clutching with the succubus and basically stripping naked before the Barbarian's superstition kicked in and he totally lopped off her head with a giant axe.
Honestly, I think going as far as intercourse, I also agree with the "fade to black" scene.