Hi,
We're happy that you like the game!
- Regarding glitching it lagging, try turning off 'shaders' option in the main menu, it will change how the night looks, but it has huge impact on performance - should help with those lags;
- regarding foreplay, you're almost spot on, but did she climax during the foreplay? She needs to in order to be properly wet and slippery, then you can proceed with penetration.
Cheers