Having the fear, or phobia of a penis. Especially and erect penis. This may cause the person with Phallaphobia to hypevenilate or even pass out.
Athena has Phallophobia and was watching tv with her friend Kevin, and he whipped out his penis and she started to hypervenilate, and then eventually passed out.
Grace couldn't have sex with her boyfriend Kenny because of her serious phallaphobia.
Kenny couldn't show his dick to his girlfriend Grace because of her phalllaphobia.