So when exactly does the sexy stuff start opening up? I've sunk a few hours into it and other than a few almost teasing moments it's more felt like I was playing a fairly bogstandard JRPG with a few contrived story elements that feel sort of like Bethesda shoehorning DLC into a game. In particular the whole castle acquisition feels near like direct plagiarism of Oblivion.
The quickest scene for femPC is giving blowjob to captain in the Oakshire Inn. Estimated time is around 15-20 minutes.
The quickest scene for malePC is getting blowjob from a female guard in the tower north-west of Oakshire. Estimated time is around 15-20+ minutes.
Other scenes in around same time:
1) watch Gavlin and his fiancee for both sexes;
2) watch G'Linda and bull for both sexes;
3) getting blowjob from Cassandra for malePC.
In around 30-40 minutes you can get:
1) watch and participate with Succubus and tentacle monster, variations for different sexes;
2) getting fucked by tentacle monster for femPC;
3) having an orgy with nuns and Succubus (huge drop in morality);
OR
4) having a scene with paladins, variants for both sexes.
In around 50 minutes you can have a scene with Ruksana near Slinsk.
In around 1.5-2 hours you can get most of Oakshire and Slinsk scenes and some Castle ones.
Honestly, I have no idea how you missed so much. But I suggest you looking for a guide to this game. IIRC, it is on page 1 of this thread alongside download links. It can give you good direction.
And of course - if you have questions about particular moments in game, you can ask here for instructions.