I haven't done a playtest to check, but I think the dev intended to be possible for Ian and Lena to not sleep with each other even while dating and all the way to chapter 8 (there's some dialogue in the game's code for such a scenario).I there any way to keep ian and lena as a will they or wont they scenario? it seems like if lena accepts ians date in chapter 4 even if in every scenario you choose no kissing and that they arent sure about each other you get forced into a few sex scenes.
Maybe to prevent some of those scenes you got automatically, you need Lena to be doing Robert and/or Mike on the side (they sometimes come up as alternatives to Ian for some scenes).