DEAR DOCTOR K: My wife and I have tried to get pregnant for over a year. We're going to be tested soon to see if anything is wrong. I'm worried that the problem lies with me. What are some reasons for a man to be infertile?
DEAR READER: About one in seven couples in the United States is unable to conceive a child after trying for one year. The infertility is caused by either the man alone (about 40 percent of the time), by the woman alone (about 40 percent of the time) or by both partners (about 20 percent of the time). So it is possible that something about you is responsible for your wife's difficulty with becoming pregnant.