It's really a shame that the anime only gets to cover the first path. There's a LOT of detail in paths 2 and 3 that you miss out on with the anime. Including some fairly significant details, like the exact nature of the Holy Grail.
There's obvious reasons for them to skip all that, since the paths all go in wildly different directions from very early on in the game, but it's still a shame.
...
What? I didn't just admit to playing porn games. No sir, not I!
(For the record, I only even LOOKED at the game because of the anime. I'd like to believe I'm not yet creepy enough to follow visual novels. )
(There's a translation for the game HERE if you're interested. The "H" scenes are mercifully sparse, especially given how badly written they are. )
(... And now I'm RECOMMENDING porn games! Something is very wrong with my life.)