I actually have a website for male masturbators www.fakevaginastore.com and I find most people that buy my products have healthy sex lives. I can imagine it being detrimental to those with sex or porn addictions but with the majority it can be a healthy part of their lives. In fact many of our customers are woman buying it for their husbands or boyfriends. Many couples enjoy bringing them into their sex lives. As for injuring yourself, just lube up and you will be fine.