I hate how people quickly comes to a conclusion that a character is gay just because they don't have the desire to have sex with a hot woman.
Like bro, not everyone is a sex addicted freak who sees a hot woman and quickly has a side quest notification in their brain saying "have sex with this woman" and the punishment for not doing it is "you're gay" or something. Like, please don't insert your personal desires and expectations to a character just because they are in a situation that you want to be in, because not everyone is supposed to be like you.
I hate how this behavior further pushes the stereotype that all men desire sex because I'll tell you, not every man is like that. Not every man wants to fuck all the time as there are men who has other desires that outweighs sex. This is the case for Light. I mean, why would he want to have sex with Misa when writing names in his "gay little diary" and saving the world from crime gives him more satisfaction and happiness than boning her.