"I've never actually wanted to sleep in the same bed as other people so I haven't found out if I actually can, but I will at the very least note that I would be okay sleeping in a smaller bed and letting others use my large one.  Even if I picked tonight to be the moment when I find out whether I can fall asleep next to you, that still only requires a significantly smaller bed."

"I've never actually wanted to sleep in the same bed as other people so I haven't found out if I actually can, but I will at the very least note that I would be okay sleeping in a smaller bed and letting others use my large one.  Even if I picked tonight to be the moment when I find out whether I can fall asleep next to you, which doesn't sound like a terrible thing to try at least once, that still only requires a significantly smaller bed."