Not sure if it is intended or accidental, but the lesbian playthrough seems to be quite a bit more chaste than the bisexual/straight one? Seems to be much less exhibitionism, much less going commando, that sort of thing.
The first few chapters are indeed a bit light on lesbian sexual content, as this was significantly expanded later on thanks to player feedback. Later in Act 1 the lesbian and straight content becomes much more balanced, with a 50/50 split between the two.
I'll be improving the early-game experience in the future to include more lesbian content.