Nobody seems to be able to answer this question.
General consensus seems to indicate that it's practically a coin-toss that the general practice has been to use the Latin "sex" in this particular instance instead of the Greek "hexa".
Sextuplets sextuplets. sextuplets
Sextuplets are six babies born at one time.
Walton sextuplets was born in 1983.
Sextuplets are extremely rare, with the chances of naturally conceiving sextuplets estimated to be about 1 in 4.7 billion. Most cases of sextuplets are usually the result of fertility treatments or assisted reproductive technologies.
The duration of Raising Sextuplets is 2760.0 seconds.
The odds of having sextuplets are 1 in 3,939,040,643.
Hanselman sextuplets was born on 2004-02-26.
As of May 10, 2015, the sextuplets will be 11
Raising Sextuplets was created on 2009-06-11.
Giannini sextuplets was born on 1980-01-11.
Rosenkowitz sextuplets was born on 1974-01-11.
No there are no all male sextuplets in the world.