The tits are actually sagging sacs of fat forming from the lower part of the neck
they were a result of sexual selection in the early evolution of the race
they were first positively selected in the males because they were the ones with the parental role of looking after the eggs, meaning they would spend long periods of time without eating
the tits can be engorged with blood for seduction purposes and can have small bony growths that get especially colorful
the designs of these bony growths is an easy way to identify the clan of origin
apart from attracting mates, scaring opponents and keeping fats, they have no other function
while it's the males who develop the "breasts", with the females acting as the bigger and stronger of the sexes, there exist a fair amount of exceptions of females that look like their males and males that look like their females that became part of the genetic variability when the the species first developed a primitive social structure that ended up keeping males and females separated for long periods of time, where the "crossdressers" were able to keep breeding away from the other group
with the difficulty of breeding and looking after eggs with the more active strong females, females croosdressers that stay with the sedentary males happen more often.