In Ranma ½, most of Ranma's classmates find themselves attracted to his female form, even though they know that he's really a guy.Viral: Why was I dreaming of Kamina!? Well, I guess I'm allowed to have sweet dr- NO, NO! NOT SWEET! NOT SWEET! The Tengen Toppa Gurren Lagann short "Viral's Sweet Dream" is pretty much all about Viral's issues with this.Maeda is further freaked out when he learns Haiji has his ideal butt. In the harem comedy Ai Kora, Handsome Lech protagonist Maeda is freaked out to learn that New Transfer Student Haiji Kikuno is a bisexual Love Freak who has the hots for him because of his "pure heart".Agravity Boys: The feminine looking Chris has male friends who fear they may find shirtless Chris attractive.Haruka herself certainly doesn't mind the attention, even going so far as to playfully flirt with some of the Inner Senshi (particularly Usagi). Several instances in Sailor Moon even after Haruka Tenoh is revealed to be a woman.The eponymous character of Hayate the Combat Butler is known to have androgynous features and has induced many uncomfortable feelings among guys every time he is forced to crossdress.
In episode 12 of Student Council's Discretion Ken is afflicted with a case of Stupid Sexy Flanders when Nakameguro shows up.
If it's taken seriously but isn't a set up for a reveal about the character's sexuality, it can sometimes lead to If It's You, It's Okay. In some of these cases, this may be caused by a Closet Key. If done enough times as a Running Gag, writers actually planning to out a character later can use this as foreshadowing. When applied to specific individuals who tend to provoke this response to people in general, see Even the Guys Want Him and Even the Girls Want Her. This often doesn't mean anything significant regarding your overall sexual orientation, though often you are just as caught off guard as the people around you.
If taken far enough you just might say something that sounds wrong even in context. You can appreciate good looks and a sexy body regardless of gender. But, you know, there are some examples of the same sex whom you can't help but admire. You are completely heterosexual, you are very much attracted to individuals of the opposite sex and you certainly aren't gay.