He's talking about things, not people! Things don't have a sex; they - or rather, their names - have a gender though, in Portuguese, Spanish, French and many other languages.
Indeed, it's one of the few things that English is simpler about.
Someone/something male is "he", someone/something female is "she" and just about everything else is a genderless "it".
Everything is referred to by the non-gender specific "
the", e.g. "
The boy and
the girl sat on
the rug and watched
the fish in
the tank eating
the food that they were given."
(A sentence that wouldn't win any literary prizes!!!

)
German is quite confusing in that there's "Der" for "the male something", "Die" for "the female something" and "Das" for "the neutral (neuter) something", but there doesn't, to the the outside observer, seem to be any logic to the assignment of gender of objects!
In English, I am male, my wife is female, all the stuff in the house is genderless and therefore an "it". (Car, table, oven, picture, beer, plant, etc.)
In German, I am male, my wife is female, but the car is neutral or male*, the table is female, the oven is male, the picture is neutral, the beer is neutral, and the plant is female!
* Depending on the word you use, Das Auto or Der Wagen!
That's before you even get started on nominative, dative and accusative cases, where the 3 words for "the" can change again dependent on how an object is being referred to, e.g. "Der Hund" is "the dog", but if you say "Ich sehe den Hund" (I see the dog) "der" becomes "den", and plural objects, even male or neutral ones, which all then become "Die", e.g. "Die Autos" making them indistinguishable (except for the pluralising "s") from the female version of "the". It still makes my brain hurt!
