Originally posted by This Year's Girl
First of all, subtext! Just because it hasn't actually "happened" doesn't mean the writers don't ever think about it... lol
And secondly, it's pretty well-known that vampire families are pretty sexually open with each other (we've already seen Darla/Angel, Dru/Angel, & Dru/Spike), so I (for one) have just always assumed that at some time or another Spike and Angel were into gettin' it on!
...
and to whoever originally asked the question, I've always seen Angel on top... partly b/c he's got vamp senority over Spike, and partly because you just know Spike loves taking it! hehe..!