Though he only considers himself a father of one, he knows of five other boys and girls conceived with his donations...but there may be more. His sperm bank says he could be the biological father of as many as nine children.
"I've received photos of the children conceived with my donations," he says. "I don't look at them and think of them in any shape or form as my children. I mean, these are children who have families."
As a pediatrician, Matthew says he tries his best to involve young children when making decisions about their future. "My disposition toward these children and the families that have contacted me is one of availability, but in a very passive way. I don't want to insert myself into their lives," he says. "I think it's really hard to predict whether or not a donor-conceived child would want a donor in their life. ... It would be my preference that if there's any kind of relationship that would evolve with them, which I'm receptive to, that would be at the initiation of the child."