Okay but if you think Spike is a dom, I hate to break it to you but did you see him with Dru???
The way he just lets himself get pushed back into something, the way he lets Drusilla do anything to him she wants, the way he leans on Dru for support when there are plenty of other things he could do. He always let Dru take the lead and before he was turned he certainly didn't want to be the one in charge.
Think about it, he's great with Buffy for sure and he seemed fine with the sex but didn't he always seem more comfortable when Drusilla was the one that initiated and took the lead?
He may have wanted the intense make-out session but Drusilla initiated, all he really did was reciprocate and press himself against her.
Anyyyyway that's my take on Spike lmaoo he's definitely not a dom and that's all I felt the need to point out. Feel free to add/discuss/disagree with my opinions on this