Yup, I think most all the books and websites I've read say that saliva is not healthy for sperm. I've read about various oils, eggwhite, etc, but I think pre-seed is the only thing that doesn't have arguments against it.
I' don't know if it is true or works, but once I heard of someone who got pregnant from using EGG WHITE mmm sounds wierd, who else have heard about it, they said it is alike the vaginal mocus, may be is just an urban leyend...
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