Someone who is romantically attracted to the opposite gender, but does not feel any sexual attraction towards them, and who has sexual attraction towards the same gender
Joe: Hey bro, I bet you could fuck her if you wanted!
Josh: Nah, not interested in females. At least not having sex with them.
Joe: Wait, so are you gay?
Josh: No, I feel romantic feelings for girls, But I don't want to have sex with them. But I am willing to have sex with another male.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi