What is sex?

What is sex?
sex is when to people engineer love when the man sticks his penis in a woman within places either contained by their but hole or vagina and once the penis is inserted the man starts goig back and forward until he finally get a pleasurful feeling where on earth he will ejaculate
A gender.
A boy, a girl.
Or
A manly, a female.
how out-of-date are you? if you are over 8 years old and you dont know what sex is after i have one interrogate for you ...WHERE HAVE YOU BEEN?
If you are asking this question contained by a serious manner step ask your mom or dad or someone close to you.