So you clicked on this link because you're wondering what these weird statues are, right?
Well, first off, they're actually carvings.
"Sheela-na-Gigs are carvings of naked females posed in a manner which displays and emphasises the genitalia. They were first brought to scientific attention in the 1840s by antiquarians. The name ?sheela-na-gig? was first published in the Proceedings of the Royal Irish Academy 1840-44 as a local name for an exhibitionist carving which was once attached to the gable wall of a church. The name sheela-na-gig comes from the Irish language - the most likely interpretations are Sighle na gCioch meaning ?the old hag of the breasts?, or Sile-ina-Giob meaning ?sheela (a name for an old woman) on her hunkers?.-Cavan County MuseumOther recorded names include the Devil Stone, the Idol, the Evil Eye Stone, Julia the Giddy, Shiela O?Dwyer, Cathleen Owen, St. Shanahan, Whore, the Witch, and the Hag of the Castle."
"Sheela-na-Gigs are religious carvings of women, special women, the symbolical representation of femininity and/or actual female deities or Goddesses. They were placed on churches, castles and other important buildings of the medieval period and, until quite recently in some instances, they acted as dedicatory or protective symbols promoting good luck and fertility.But their meaning goes much deeper and the fact that they were erected over the doorways of churches and castles and otherwise placed invery prominent positions suggests that they were a very potent and powerful image, obviously the primary religious belief of the people of that era of christianity."
-From Sheela-na-gigs by Jack Roberts (a great article, go read it, and if you can, buy his book!)
Sheila-na-Gig = sheela na gig, from the Irish Sile nà gCioch" = sheela na gee-och, which means Sheila of the breasts. An ancient fertility icon, Sheila-na-Gigs are stone figurines of women, usually many breasted, and holding open their vaginas. Found in isolation and in medieval church walls.-From Susan McKeown's Page