I agree with Matt’s answer. I would add that there was a time (maybe 1950’s or 1960’s) when, at parties for a man (such as a birthday party for a rich man), a beautiful young woman might be hired to jump naked (or in a bikini) out of a large, fake cake — all as a “sexy” surprise for the man who’s birthday it was. I’ve seen things like this in older movies (with bikini, not naked). It seems like a very old-fashioned sort of thing.