Since I was curious too, I dug up this: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1847503/#:~:text=Immediately https://www.ncbi.nlm.nih.gov/pmc/articles/PMC

Since I was curious too, I dug up this: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1847503/#:~:text=Immediately https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1847503/#:~:tex... Multiple males do mate with the queen, with the everted endophallus acting as a signal to other males and perhaps offering protection from the queen's stinger. Technical term seems to be "mating sign," and males prefer queens with a mating sign.