Thanks for playing.
The game didn't lag at all on my PC except for the shader compilation at the beginning, which I can't do much about, but I was testing on Linux only (the web version, the Linux version and the Windows version using Wine).
When I switched to Windows, there's lag when a werewolf dies and some times when fighting, but not when walking around. Is that what you're experiencing?
I have no idea why Windows doesn't run the game well, but I'll look into it.
Edit: You can skip sex scenes with the inventory button. I'll add a little UI element that indicates that during the scenes.