I always thought that was what all of the Barmaids were for, but now I see that I was narrowing the field artificially!
You thought that barmaids were in the game so that PCs could capture them and then mate with them?
You now wish to extend that pattern to captured kobolds?
If you read carefully, you will notice that some of us think this isn't an OK thing to do to captured kobolds. Those of us who object to a PC forcibly mating with kobold survivors, will also object to a PC forcibly mating with human or demi-human barmaids.
When I'm running D&D, and the PCs walk into the "Freona's Teakettle" tavern in Phlan, the barmaids exist to (a) serve beverages, and (b) add some individual personalities to the setting. One of the PCs, a halfling rogue, tried to *flirt* with one of Freona's daughters, and that's RP of a *consensual interaction*. I used it as a story hook; when the PC was verbally puffing himself up as a mating display, the halfing barmaid asked if the PC could help find and rescue a friend who had gone missing (Valonna, a female gnome). Damsel in distress, sure, but that's different from imposing something on a captive.
The idea that females exist primarily for the purpose of male sexual gratification was common in the early years of D&D, but these days it has become a controversial position; in some circles, it's quite unpopular. IMO, the 5E fluff does not support "Chronicles of Gor" as a compatible setting.
You posted an indirect implication about barmaids, without using the R-word. There are wet-blanket killjoys (such as myself), who bring any such implication under direct scrutiny. If you boldly take a stance about the proper role of barmaids in D&D, I'll happily debate you on fair terms, here or elsewhere. When you're back-handed about it, though, I'm not impressed or amused by your cleverness.
Are you, perhaps, "Cheeto", from the Dead Alewives comedy sketch of a D&D session?
(It's best known for a passage about casting Magic Missile at darkness, and it's basically about adolescent boys.)
Here's a few lines from that skit:
DM: No, you're outside, by the tavern.
Cheeto: Cool, I get drunk.
(snip)
DM: You're not there! You're getting drunk!
Cheeto: OK, but if there's any girls there, I wanna DO them!