You can increase the number of sex action easily if you have the Constants mod active. It comes with the game but you have to click on the Mods button in the Main menu, click on the Constants mod button, then click apply. The game will close (it looks like it crashes, but don't panic). Now restart the game and there should be a Constants button in the Main menu. Click on it. There will be a page of variable with values you can change. The variable you want is labeled "timeforinteractions".