Nah i don't think so as at start its neutral to everyything an changes based on what you do. Along with potions to help force change it when ever you want.
I think there are some bugs. It doesn't always follow choices. (For example, I tested playing a lesbian MC by playing a female MC who only had sex with other female characters--acolytes, nymphs, female bandits, didn't get to Vicoria yet--and her sexuality was still "bisexual" after 40 days in-game and lots and lots of female-only sex scenes.) Also, access to white berries needed for the potions doesn't come until several storylines into the game.
I like that the game mostly follows what you decide. It's a wonderful rpg that is always building a new experience. But there are some reasons it would be nice if we could decide our starting sexuality, just like we do our starting stats. Then the game can still change the way it does now, if we make different choices. Just my thoughts... Thank you for your consideration.