An individual doesn't need sex in order to survive or be healthy.
However the human species would eventually become extinct if no one had sex.
Yes.Another View: The physical act of sexual intercourse is NOT necessary. Only that the human egg be fertilized by a human sperm. This is an act which can be duplicated by means of artificial insemination and does not require a sex act to do it.
Of course sex isn't necessary
Psychologists tell us that the three most basic human drives are Sex, Fear and Hunger. Fear protects us, Hunger fuels us, and Sex is absolutely necessary for human reproduction, of course, so we humans are programmed -- especially us males -- to seek it out at every opportunity.
sex sex and more sex
A human sex cell has 22 autosomes and 1 sex chromosome (23 total).
It is necessary to permit same-sex couples to marry so that they are not unfairly denied the rights and privileges of marriage.
Sex+human
There are 23 haploid chromosomes in a normal human gamete (sex cell).
There are 23 haploid chromosomes in a normal human gamete (sex cell).
In genetic studies, human sex chromosomes are labeled as X and Y.
There are 23 haploid chromosomes in a normal human gamete (sex cell).
have sex