We have a sofa bed, however when I asked DH if I could offer it to a fellow MNetter after a night out, he flatly refused. Not that I have to "ask" IYSWIM, but thought that it was only polite to see what he thought....
Anyway, as I expected, he said no. When I asked what his reasons were, he said "I'm not having a strange woman in the house who might boke everywhere and try to jump me"
Make of that what you will....