What in the world? Is this normal?

[SMTHook]

Why do they shed them?? My boa has dropped a few of those over the years. His were confirmed sperm plugs but I just wondered why this happens

From what I've been told it prevents or inhibits the ability of other males sperm to get through and impregnate the female.

Update: Definitely Male and definitely a sperm plug. Is there any way to edit title for future search purposes?