The idea of associating fleas with lovers is really novel. In the history of world poetry, when people praise love, they always use beautiful images and gorgeous poems. However, this poem "Flea" is quite different. It uses17th century "fleas" that often appear in daily life of British people, but people hate them at first sight, and connects them with love and marriage that human beings regard as sacred, so as to persuade them to fall in love together.
The whole poem is divided into three sections, interlocking and progressive. In the first section, the lyric hero urges his lover to pay attention to fleas. Since the flea sucked their blood and blended into the body, her refusal to him seemed insignificant and useless. In his view, fleas have helped them complete the blending of blood, and this is not a sin, not a shame, not to mention losing their virginity. Fleas that suck their blood, like babies whose parents have blood, "swell up".