A study of 82 bacula, the bones found in the penis of most male mammals, suggests that they may be used to displace sperm from another male already in a female’s reproductive tract
Source:
https://www.newscientist.com/article/2256974-some-animals-may-use-their-penis-bone-to-scoop-out-a-rivals-sperm/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home