The only suggestion and food for thought so to speak is that although it has been proven to reduce your chances of tearing it can also do damage to your pelvic floor muscles because your pelvic floor muscles to loose some of its strength and flexibility as it is not designed to be stretched for time periods over a several week period. This could lead to urinary incontence later on. This is from the research I did for my midwifery course. The other issue is that if a woman is going to tear she is going to tear. Just giving you some information and please do with it as you wish.