Naked. It is about being close to nature, a natural state, unadorned, flaws and all. You can't really hide it, it is still there under all the wrapping and packaging. It is also about being accepting of your real self rather than something that you are not and cannot be.
Lingerie. I like the whole "leave something to the imagination" aspect.
It's like a steak. Great on it's own but even better when dressed up with something nice. It catches your eye more.
My wife switches between the two and I love both but, if I had to chose one for the rest of my life, lngerie would win. She agrees and adds that it makes her feel sexy.
This is a tough one for me - I've always had a thing for lingerie, and love wearing it, not only for boyfriends but for myself as well, makes me feel good!! Being naked on the other hand... my OH's given me major body confidence lately so I've felt more comfortable being naked. I do tend to sleep in the nude as there's no restrictions or distractions when it comes to slumber, although when it's playtime I do like to dress up. Whether or not it comes off on the other hand..... remains to be seen!!
As for what I prefer on the opposite sex..... naked.