I had DH download the book (I think it's titled "the sperm meets egg plan" not 100% sure) from Amazon, just because it is free. He started reading and he started asking all these questions, one of them made me laugh, he asked what OPK stood for, I told him, he still did not know, I then said, uhhhh you remember those things you bought me last time? lol he said that he did not even know what he was getting, he just followed the link I send him and the instructions, haha. I am like, well damn, next time I will send you a link to something else I want and you will have no idea.