Cum Nazi

Cum Nazi is a "catch all" term for an entity, situation or item that stops the delivery of ejaculatory fluid in any capacity or uses lack of sex as forfeit. For example a prophylactic could be referred to as a Cum Nazi, or a female who is punishing a significant other by withdrawing copulation.

Can also be a term for a more serious form of cock block.

Example one:
"Damn, Sharon hasn't has sex with me since she found my stash of jazz mags." - Person one.
"She sounds like a real Cum Nazi, bro."
Example two:
"I hate condoms, they are just Cum Nazis."