A kurtsexual is someone who is neither homosexual nor hetrosexual, as they do not like anyone else apart from Nirvana's lead singer, Kurt Cobain, despite him being dead. Kurtsexuals are usually 13 year old boys who have covered their room with posters of Kurt, done drugs or desire to take heroin to be like Kurt, tried to shoot themselves in the head with a shotgun, bought all his signed stuff off eBay, and want to go visit his grave sometime.
Dean : "Hey man, this girl wants to have anal with you on Friday
Jack: Nahh, I'm only interested in Kurt. i'm a kurtsexual. MM fuck yeah, Kurt Cobain :P
* masturbates whilst lookingg at lifesize poster of Kurt Cobain and making orgasmic noises*
Dean: Mmm you need to get a life. Kurt's dead