I am trying hard to not dig myself into a hole when answering these types of questions
Ideally I want to make sex scenes optional, and most of the time I will succeed in that. However, there are times when something is story driven and "has" to happen. At the moment, I have no unavoidable lesbian content planned. This is not a promise it couldn't happen. When I mean optional, I mean that I try and write the game in such a way that the sex doesn't happen at all if you opt out of it. If it happened and characters acted as if it happened, you just skip seeing it, that's meh to me.
There might also be different opinions on what a "lesbian" scene is. If you're banging two girls and they kiss each other during the sex, is that lesbian. Kind of - but since you (the male MC) is still the center of the sex scene - not really?
The whole game happens from the view of the MC (his presence, but not first person). There won't be any paths where some girls take off on their own and have their own thing branch in the game.
One more thing - I think girl on girl action is pretty hot and I know many think dev's doing stuff they don't personally like is a waste of dev time that could be better used. This is, from their points of view, true. I'll admit I feel the same when I game I enjoy suddenly decides to throw in something I'm not interested in (futas being my favorite example).
I'm rambling again. The next update will probably 0.2% smaller due to me spending time here with ya'all writing long-ass posts about this and that