The inn will pick up and add various men and women/magical creatures and things along their journey. So, I guess it's haremish. I have a pregnant character already modeled and ready to grow as the story progresses and the Gnomes are pretty much down for anything.
No, the mc will not be the only character with sex scenes. I plan on adding brothels in towns the crew visits along the way that will open up choices as optional content. I honestly don't have anything set in stone as far as sex goes, but I do plan to try and add something for almost everybody as long as it's legal and doesn't violate terms. I know you want really specific answers, but I don't have them. I have the main story boarded out lightly through book 3 and a solid storybook completely done for book 1, but I change things all the time as I'm writing.