A member asked:

My fiance has 3 boys...is it true some men can only make one gender?

3 doctors weighed in across 2 answers

No: Every man produces sperm with x and y chromosomes, equally distributed between x and y.

Answered 2/2/2015

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Coin flip: Men produce equal numbers of sperm that carry either an X or Y sex chromosome.The healthy sperm that gets to the egg first decides the gender. It's like flipping a coin.You have an equal chance that it would be boy or girl each time, but it could be boy or girl three times in a row. It just happens. The idea that men can only have one gender offspring is a myth.

Answered 11/28/2017

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