male and female; the two sexes
Primarily used for animals; can also refer to the two sexes more broadly.
It is difficult to distinguish the male and female of this bird.
victory and defeat; strengths and weaknesses
Often used in the phrase 雌雄を決する (to fight it out, to decide the outcome).
The two teams will decide the victory tomorrow.
It's still hard to tell whether this chick is male or female.
The two of them fought it out in the final to see who would win.
雌雄 in this sense is a literary word almost always paired with 決する to mean 'settle who wins', while 勝敗 is the plain, everyday word for 'victory or defeat'.
勝負 means a match or contest and its outcome, whereas 雌雄 (as in 雌雄を決する) is a more formal, idiomatic way of saying the outcome will be decided.
Compound of 雌 (female) and 雄 (male). The extended sense of 'victory and defeat' likely comes from the idea of a contest between two opposing forces.
gynandromorph