If a human male and female produce children what portion of their offspring would males be?

In humans, the sex of offspring is determined by the combination of sex chromosomes contributed by both parents. A male has one X and one Y chromosome (XY), while a female has two X chromosomes (XX). Each child has a 50% chance of being male (XY) and a 50% chance of being female (XX), so, on average, half of their children will be male.