This is a seri of "sexual imagery" as ophelia said that is also associate to paintings. This work is usually seen as a commentary on desire - not only sexual, but the kind of primal, ungoverned urges elemental to the human psyche. 

Ophelia's point is that such instincts are ultimately controlled by agents other than ourselves: socially conditioned; culturally diluted; or quite simply exploited, with our needs, wants and desires channelled into an insatiable urge to consume.