Oi, I didn't even notice that double entendre until it was mentioned here. Personally, I don't think that was deliberate. The idea is that that type of spy operative is named for birds, men are Ravens (I think) and women are Swallows. So it makes sense that a picture of a woman who is that kind of spy would have the subtitle "Swallow". The others all have their own subtitles also.
Sometimes a cigar is just a cigar.