I both envy and pity them for having lives in which this is genuinely the biggest thing they have to worry about.
Aside from the common misunderstanding about the difference between sex and gender (as a PP has pointed out), I honestly can't see the fascination and jubilating about finding out when there are only two variables and (except in very rare cases where there is a gene in the family for a serious condition that only affects males), neither of those options is better or worse than the other.
It's not like Deal Or No Deal, where people are joining hands 'for luck', crossing their fingers and biting their lips, desperate to see if their box contains a penny or a quarter of a million pounds. It's akin to buying an off-plan new-build on a big development of identical houses and then throwing a party to reveal whether your home ends up having an odd or an even number.
I thoroughly agree that this would be truly devastating to couples unable to have any baby or whose baby has extremely serious health problems - seeing people with a (hopefully) healthy, much-wanted baby on the way throwing such a tantrum about finding out what the baby happens to have between his or her legs.