I was a severe stutterer until I got fluent in my mid 20s. I have three kids. 18yo is on a full ride at a top university. 14yo twins are both doing incredible. None of them stutter. \----- As to the sperm bank. They get paid A LOT of money from their clients. The people seeking assistance at sperm banks are going to be ultra selective. This isn't a reflection on you in any way. But no one "shopping" for donor sperm is going to choose anything less than perfection. It's an illusion of perfection, as many people lie their asses off any don't admit much more serious issues than a speech impediment. I wouldn't give it another thought if I were you.