Fighting to the death and mating are not the same!
There are a number of species where the female eats the male after mating - examples such as praying mantis and octopus. Both octopus males and females die after mating, the female after having protected the eggs, so it makes sense that she sometimes eats the male too (who is going to die anyway). But, examples like this are relatively rare, and for species specific reasons.
Fighting to the death and mating are not the same!
There are a number of species where the female eats the male after mating - examples such as praying mantis and octopus. Both octopus males and females die after mating, the female after having protected the eggs, so it makes sense that she sometimes eats the male too (who is going to die anyway). But, examples like this are relatively rare, and for species specific reasons.
"What animal species often offers males only one chance of mating ?!"
"Fighting to the death and mating are not the same!"
Your original question and your current statement are in confliction. Pick one.
> If you are a male and you only get one chance at mating, you will probably fight to the death
This is the comment I was responding to.
The question was about pre-mating death matches between males, not post-mating snacking behavior of females.