---
title: 'Why Are Males Always Eaten During Sex?'
source: 'https://youtube.com/watch?v=hTyU-1Y8oCo'
video_id: 'hTyU-1Y8oCo'
date: 2026-07-27
duration_sec: 234
---

# Why Are Males Always Eaten During Sex?

> Source: [Why Are Males Always Eaten During Sex?](https://youtube.com/watch?v=hTyU-1Y8oCo)

## Summary

This video explores the phenomenon of sexual cannibalism, where females eat males before, during, or after mating. It explains the evolutionary reasons behind this behavior in species like praying mantises and redback spiders, highlighting how it can benefit both sexes under certain conditions.

### Key Points

- **Sexual cannibalism introduction** [00:00] — Female praying mantises sometimes eat the male's head during mating. This behavior is called sexual cannibalism and occurs in many species, almost always with the female eating the male.
- **Why females eat males** [00:42] — Since females lay eggs or nurture offspring, males eating females would be detrimental to reproduction. In species where males don't help raise young, the female benefits from consuming a protein-rich mate to support egg production.
- **Evidence from mantises** [01:27] — A study found that female mantises that ate their mates laid more than twice as many eggs as those that didn't, suggesting a direct reproductive benefit.
- **Male self-sacrifice in redback spiders** [01:54] — Male redback spiders somersault into the female's mouth after mating, sacrificing themselves. This may have evolved because most males die before mating, so self-sacrifice ensures offspring are well-provided.
- **Pre-mating cannibalism** [02:22] — Sometimes females eat potential mates before mating, which seems counterproductive. This can occur due to high female aggression that accidentally targets males.

### Conclusion

Sexual cannibalism, while seemingly extreme, often provides evolutionary advantages such as increased egg production or ensuring male genes are passed on when mating opportunities are scarce.

## Transcript

In the middle of baby-making, a female  praying mantis will sometimes chomp down   on a male’s head, then devour him  as she finishes mating with him. And mantises aren’t alone; many  different species lunch on their lovers.
it’s almost always the females doing the eating.  Why is it dudes that always end up as dinner? [Kate:] Oh, sorry! This is MinuteEarth.
All sorts of critters will occasionally munch  on members of their own species, but here,   we’re talking specifically about when an animal  eats its mate – or potential mate – before,   during, or right after babymaking, which  scientists call “sexual cannibalism”.
And – think about it – since females are  the sex that lays the eggs or nurtures   the offspring inside their own bodies,  if a male eats a female before, during,   So any male who regularly dined on his dates  wouldn’t be able to pass along the habit.
habit of lunching on their lovers – and  sometimes, that habit really pays off. raise the babies doesn’t make a lot of sense.
But in species where males don’t help  out, the female gets left alone to   raise the babies – sometimes a LOT of  babies – which takes a lot of energy. So if a convenient, protein-packed snack is, like,  RIGHT THERE, it benefits her bigtime to chow down.
One study found that mantis females  that ate their mates laid more than   twice as many eggs as those that didn’t.  Which might make it seem like mate-eating   helps both female AND male mantises  leave behind a bigger genetic legacy.
But since the male ends up dead, his future  prospects are over; if he hadn't been eaten,   he could have gone on to mate again – and  again, leaving way more babies behind. In some cases, though, getting  eaten does seem to benefit males.
After redback spiders mate, the  male often somersaults into the   Scientists think this self-sacrifice  evolved because in this species,   the vast majority of males get eaten by  predators before they ever get a chance to mate.
So if a male redback does get  lucky enough to actually get lucky,   he might as well sacrifice himself to his mate  to make sure the babies are well-provided for.
So we've covered why males get eaten during and  after babymaking, but what’s up with eating a   potential partner before mating, which guarantees  exactly zero offspring from the pair-up? competition is intense, so it really  pays for females to be super aggressive,  
and all that innate aggression can accidentally  end up directed toward a potential mate...oops! The bottom line is that, while  it seems unthinkable to us,   sometimes it does make sense for  females to plate their dates.
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