Sex addiction is simply a new name for the old evolutionary concept—the innate urge to impregnate as many females as possible.
Birenbaum-Carmeli also points to technology that means even a near-sterile man can now be assisted to impregnate his wife.
impregnate im·preg·nate (ĭm-prěg'nāt)
v. im·preg·nat·ed, im·preg·nat·ing, im·preg·nates
To make pregnant; to cause to conceive; inseminate.
To fertilize an ovum.
To fill throughout; saturate.