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Random
When something is so vile and such a massive turnoff that your penis literally panics and retreats back into your body. This is a defense mechanism and natural instinct so your penis can not be sexually violated by what has been deemed so repulsive.
When I had found out my mom's ex boyfriend texted me about how horny he was, thinking it was my mom's phone number, it gave me a reverse erection.
You’re probably a girl or a gay guy if you have this
Dude, Tommy over there has a reverse erection
when you get a boner and drop a weight on your dick making it all floppy and mushy
man, last night with Cara was intense, i was about to nut when she hit me with the reverse erection