Here's something interesting - just picked up Armies of the Abyss from Green Ronin Publishing, and in Appendix 1, there's a new Pleasure domain that revolves around sexual pleasure. It also includes 2 new spells for that domain: phantasmal lover and phantasmal orgy. Best part - it's all OGC, so we can incorporate it into our guide as long as we give credit.
If anyone wants more details, let me know. They've also got stats on Incubi in there, as well as a demon called an alrune that's straight out of horror hentai.