Wesley nailed the nail on the head when he asked...whomever, if he/she realized how rare true happiness actually is? And how most people live an entire lifetime without finding it. I would have liked to have seen, or at least Buffy and Angel make reference to, trying to satisfy each other but in inferior ways after he came back from Hell. So Angel isn't completely happy with the, let's say action or intimacy, he and Buffy perform in S3. Their inevitable break up could still occur, even in the same way. Unless i missed that completely, and if i did someone point me to it.
After Wesley's line about true happiness, I always thought something to the effect of. "Why don't they just pinch or poke or do something else unpleasant. Before Angel, you know."
I would honestly, drastically change both Bangel and Spuffy from what we were given. But that would take to long to explain. The above is just something minor while letting the show remain the same.
Yea, I honestly think that if they had stayed together they would have worked the sex thing out eventually, but so many other things kept them apart, namely Angel getting his own show (Ugh I hate it when that happens). In Season 3, everything from Angelus' reign of terror was so raw and both felt so guilty I think they were afraid of any intimacy for fear that they would be "responsible" for bringing Angelus back. That probably did more for keeping them apart than the curse itself.
Afterall, later in Angel they seemed to decide that Angel could have sex and David Greenwalt said "I've been dying to do the scene," he admits, "where Angel turns to a woman and says, 'You know, I can't know perfect happiness, but that doesn't mean you can't.'" And to bad he never got to do that, but at least it gave all of the fan fiction writers tons to work with lol.