The quality of being biologically attractive, or the physical attraction based upon the laws of nature. Certain facial features and body types of both the male and female gender are appealing to all humans, including symmetrical facial structure, the ability to retain body fat, and fertility, among other physical attributes. Charles Darwin did not create this word, although he created the concept. The human race is bent on survival, thus we seek partners who can aid in creating the next generation of humans adept at survival.
The quality of being biotractive is not merely achieved by outside influences, including working out, plastic surgery, supplements, etcetera; but is actually achieved by naturally occurring genetic traits obtained from both the mother and father, along with preceding generations.
Damn, look at that immaculate facial structure; he's so biotractive.