Fine, in that case, why is it a disadvantage for the males?

Now please don't tell me "it doesn't have to be a disadvantage for males, it might just be an advantage for females" !

> why is it a disadvantage for the males?

Who said it was? Just because males don't exhibit a behaviour doesn't mean it's necessarily an evolutionary disadvantage.

how do you explain the females do and the males don't? that sounds like a systematic occurrence

> why is it a disadvantage for the males?

Who said it was? Just because males don't exhibit a behaviour doesn't mean it's necessarily a disadvantage.