Oh God, noooooo! xD Reading the synopsis on Wikipedia was bad enough. >.< Angels do not do pity sex! And that's only one of the many many things about that that annoyed me!

Because they're the two most powerful angels, I guess, and as Mikhail said, most people only know the names of those two a gels and so they're the first names that come to mind when trying to write something about inter-angel conflict. violent sex? ;)

The movie horrified Gabriel, by the way.