Actually, LadyCFII, when I originally read that as I was looking everything over, I remember thinking that was what it meant. But then when I came here to these forums, I got the impression from something I read that it could end up making them infertile. I don't know why I thought that because from what it actually says, it's obvious that it just becomes less effective. I just wasn't positive whether you only needed to use it on one of the adults though or if it had to be used on both, but you explained that it only needed to be used on one to help.