Man, I love the feeling of a man on top of me. I don't mean in missionary sex, either (although god yeah do I love that and I don't think it should ever be disdained as boring or old-fashioned or "missionary", because it feels fucking awesome); I mean a man just lying on top of me cuddling, his weight and his warmth pressing down on me. It's tremendously comforting in a very primal, animal way. It makes me feel safe.
Okay, with your larger sized men there's a certain tightrope to walk between "I feel so safe" and "*gasp*... air...", but it's so worth it.