I've done this when I had the chance, because it was exciting both for my husband and myself! There have been a few times when I've had a friend or a female cousin over at the house and we've been in my bedroom trying on clothes, and I've left the bedroom door open because nobody else was home. Then my husband has "accidentally" come home while we were changing and stuck his head in the bedroom to say hello. You can never time things like that perfectly, but once he caught my cousin in nothing but a bra, nude from the waist down, and she jumped so bad I swear her head nearly hit the ceiling!