100,000 years into the future, sexual selection could mean that two distinct breeds of human will have developed.
The alarming prediction comes from evolutionary theorist Oliver Curry from the London School of Economics, who says that the human race will have reached its physical peak by the year 3000.
These humans will be between 6ft and 7ft tall and they will live up to 120 years.
"Physical features will be driven by indicators of health, youth and fertility that men and women have evolved to look for in potential mates," says the report, which suggests that advances in cosmetic surgery and other body modifying techniques will effectively homogenise our appearance.
Men will have symmetrical facial features, deeper voices and bigger penises, according to Curry in a report commissioned for men's satellite TV channel Bravo.
Women will all have glossy hair, smooth hairless skin, large eyes and pert breasts, according to Curry.
Racial differences will be a thing of the past as interbreeding produces a single coffee-coloured skin tone.
The future for our descendants isn't all long life, perfect bodies and chiselled features, however.
While humans will reach their peak in 1000 years' time, 10,000 years later our reliance on technology will have begun to dramatically change our appearance.
Medicine will weaken our immune system and we will begin to appear more child-like.
Dr Curry said: "The report suggests that the future of man will be a story of the good, the bad and the ugly.
"While science and technology have the potential to create an ideal habitat for humanity over the next millennium, there is the possibility of a monumental genetic hangover over the subsequent millennia due to an over-reliance on technology reducing our natural capacity to resist disease, or our evolved ability to get along with each other.
"After that, things could get ugly, with the possible emergence of genetic 'haves' and 'have-nots'."
Dr Curry's theory may strike a chord with readers who have read H G Wells' classic novel The Time Machine, in particular his descriptions of the Eloi and the Morlock races.
In the 1895 book, the human race has evolved into two distinct species, the highly intelligent and wealthy Eloi and the frightening, animalistic Morlock who are destined to work underground to keep the Eloi happy.