Men can choose a condom. If a man truly does not want to be a father he can also have a vasectomy, which is very easily reversible if he changes his mind later on. If he does not want to have a vasectomy, the combination of condom and diaphragm used during the woman’s fertile period (typically days 10 to 20 of her cycle) is essentially 100% effective. Many, many options here for men to make choices to avoid fatherhood.