An alien sentient species has external fertilization. They do a full lay-the-eggs-in-a-pool-then-leave-the-fertilized-eggs-to grow-in-the-wild cycle as if they were salmon or similar. The female chooses which males she allows to fertilize her eggs. But if some other male manages to spray his milt over her eggs before her chosen males does, would you call that a kind of rape?
ISTM that this would be equivalent to those cases in which a creepy fertility doctor switches the sperm with his own, and they don’t find out until later. IIRC, those aren’t treated as rape, but they are serious crimes, which seems about right to me.
Maybe not rape itself, since the female’s body technically wasn’t directly violated/penetrated, but it definitely is some violation of consent.
I doubt they’d have anything like the concept of rape that we do. I would expect them to consider that some sort of crime; though I suppose it would depend on the rest of the culture.
Even among us: if a woman had an egg fertilized in vitro and then implanted, but the sperm that was used wasn’t from the donor she selected, I doubt that whoever made the substitution could be charged with rape; even with the pregnancy occurring within her body. I expect they could be charged with something; exactly what would depend on the law in that jurisdiction.
I guess my thinking here is that this isn’t the direct equivalent of human artificial insemination by deception. It’s, to me, in some way I can’t really explain, violative of this species’ actual sex act in a way that a fraudulent sperm donor isn’t?
I’m not talking, BTW, of a male fertilizing her eggs stealthily. I’m talking about it openly happening and the female seeing it happening. That, to me, is a functional difference from the human in vitro case.
“Choice theft”?
I’ll suggest it depends a bit in what the parenting process for this species is. If the female chooses her mate, the male milts the eggs, then both walk / swim away never to see the outcome that’s a very different situation than if they jointly tend the nest until hatching and then jointly actively raise the hatchlings to maturity.
In the former case, the harm to the interests of the female is small, as is the harm to the male who didn’t get the intended chance to fertilize. Presumably they can try again on another occasion. Some disappointment perhaps, but maybe not even rising to anger.
In the latter case, the harm is comparatively vast. What do the female or intended male do about rearing this misbegotten brood? What does the interloper do? If these were critters with human-like personalities, the interloper would probably laugh and disappear, the female would dutifully do her duty to the wrong-male offspring, and the intended male parent could do almost anything from be a devoted but cuckolded father to simply disappearing. Perhaps after killing the interloper.
So the latter scenario comes a lot closer to human rape than the former is.
Almost-related point:
I don’t know if any human societies have ever distinguished between the crimes of rape not resulting in pregnancy versus rape resulting in pregnancy. Or of human societies that have very different formal and informal expectations about how a woman treats her infant that’s a product of rape versus the product of normal consensual relations outside of marriage vs a product of marriage.
If such human societies exist, IMO it’d be instructive to dig around in their laws and customs to try to draw parallels to the OP’s aliens.
It sounds almost Darwinian in that despite the female’s choice, it is the male most capable of fertilizing the eggs that gets to reproduce.
IOW, where’s Biff Tannen when we need him?
Sorry but… I do not understand what the (TW) in the title stands for. I hope it isn’t too obvious.
Trigger warning.
OK. Thanks. Do most people know that one? Since it’s a warning you want everyone to know what you’re talking about. People who need trigger warnings might not be up on all the latest initialisms.
But I guess this is the crystal clarity of message we get from today’s web. Learn what every single set of initials mean or get left behind!
Turns out it’s very obvious. But only once you know what it means.
Can a male be raped? If so, in the case of a male does it require that male to be penetrated?
On thinking about this… Is that even relevant? If you stab a woman with a knife, you’ve violated and penetrated her body, and it’s certainly a crime, but it’s not rape. What makes it rape isn’t that you’re violating the victim’s bodily autonomy, but that you’re violating their sexual autonomy. Which would also be happening in this hypothetical scenario.
You’re assuming the female and/or chosen males aren’t going to destroy those eggs.
It’s a little of column A, a little of column B - the feamle will watch the eggs until hatching, but then the larvae swim off to grow up without further parental care.
None that I know of.
Good point. One I’d completely overlooked in thinking about it. 
Lions are of course (in)famous for the alpha male killing any cubs he didn’t sire. So infanticide of the misbegotten isn’t unprecedented normal behavior for at least some species whether carried out pre- or post- hatching / birth.
A society in which the male could ignore the female selection of father to her spawn and the female makes relatively little investment in her spawn?
If the chosen male has invested a lot to become chosen then he is going to invest more in guarding them and will possibly be chosen based on his perceived ability to do so. The society will either shun the male incapable of guarding them or set up very specific rules regarding honoring the choice, with violations considered as much of a crime as rape is.