I always heard an old wives tale about that growing up
There was an experiment done once where they injected a man with enough blood to support both an erection and brain activity at the same time.
He got horny, stupid, and blew the end of his dick off.
My cousin claims to have a fully erect penis of 11 inches, and he said that he does get dizzy and lightheaded when fully erect. He also claims it is very difficult for him to get fully erect, and usually he can only get a semi of around 8 inches unless he is extremely turned on or sustains the erection for a long enough time.
Take that with a grain of salt.
Yes, me
I get anti-dizzy if I get an erection