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http://en.wikipedia.org/wiki/Romanesque_art

Subject matter

Most Romanesque sculpture is pictorial and Biblical in subject. A great variety of themes are found on capitals and include scenes of Creation and the Fall of Man, episodes from the life of Christ and those Old Testament scenes which prefigure his Death and Resurrection, such as Jonah and the Whale and Daniel in the Lions' Den. Many Nativity scenes occur, the theme of the Three Kings being particularly popular. The cloisters of Santo Domingo de Silos Abbey in Northern Spain, and Moissac are fine examples surviving complete.

A feature of some Romanesque churches is the extensive sculptural scheme which covers the area surrounding the portal or, in some case, much of the facade. Angouleme Cathedral in France has a highly elaborate scheme of sculpture set within the broad niches created by the arcading of the facade. In Spain, an elaborate pictorial scheme in low relief surrounds the door of the church of Santa Maria at Ripoll.[6]
Around the upper wall of the chancel at the Abbaye d'Arthous, Landes, France, are small figures depicting lust, intemperance and a Barbary ape, symbol of human depravity.pic P Charpiat

The purpose of the sculptural schemes was to convey a message that the Christian believer should recognize wrong-doing, repent and be redeemed. The Last Judgement reminds the believer to repent. The carved or painted Crucifix, displayed prominently within the church, reminds the sinner of redemption.
Ouroboros, single and in pairs at Kilpeck, England

Often the sculpture is alarming in form and in subject matter. These works are found on capitals, corbels and bosses, or entwined in the foliage on door mouldings. They represent forms that are not easily recognizable today. Common motifs include Sheela na Gig, fearsome demons, ouroboros or dragons swallowing their tails, and many other mythical creatures with obscure meaning. Spirals and paired motifs originally had special significance in oral tradition that has been lost or rejected by modern scholars.

The Seven Deadly Sins including lust, gluttony and avarice are also frequently represented. The appearance of many figures with oversized genitals can be equated with carnal sin, and so can the numerous figures shown with protruding tongues, which are a feature of the doorway of Lincoln Cathedral. Pulling one's beard was a symbol of masturbation, and pulling one's mouth wide open was also a sign of lewdity. A common theme found on capitals of this period is a tongue poker or beard stroker being beaten by his wife or seized by demons. Demons fighting over the soul of a wrongdoer such as a miser is another popular subject.[8]