No offense but girls have a lot more pressure on them when it comes to formal events. A guy can walk into prom in button up shirt and a tie and still be considered dressed alright. A girl can't walk into prom in some casual summer dress or anything, it's not that easy. The amount of money girls spend on prom is probably WAY more than guys. Guys can just rent a tux anyway, not many girls can rent or want to rent a dress, a lot of girls pay for a limo (or make it a group thing), hair/makeup/nails costs way too much. A set of acrylic nails costs 50$, hair can cost anywhere from 80-300$ depending on what you're getting done. I don't know much about makeup. Prom dresses are insanely expensive and occasionally girls get WEDDING dresses as prom dersses. I mean, it's some crazy shit. If I'm gonna be dancing and having fun all night long I don't want to wear an uncomfortable dress t hat's just going to be beer/vomit/cum stained in the morning.