spermicidal

An deliberate activity or action by a male that results in his failing to have sex.

"Dude, are you going to the Sorority Lingerie Party ?"
"No bro, I need to study."
"That's spermicidal, man !"
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"I told Sheryl that I am still in love with my ex, and she dumped me..."
"Wow, that was spermicidal !"