===Lea's shield=== 

 I have serious doubts about the failure rates associated with Lea's shield. I've read the FDA Summary of Safety and Effectiveness (http://www.fda.gov/cdrh/pdf/P010043b.pdf) and they talk about 9% and 14% rates (with and without spermicide). In fact, the low indexes I have found are at http://www.contraceptiononline.org/contrareport/article01.cfm?art=210, and they talk about 4 and 6%, but correcting the statistics because of a supposed bias associated with few nulliparous users. Anyway, it seems that till now the data is scarce, so if we choose to say 4% I would add a note about low sample used.  
  saragc