In episode 180 of the TV series, Haruka and Seiya met for the first time. Haruka was with Usagi, to whom Seiya said,

Seiya: Heh. That's some good-looking guy you're with.

Arrow: “some good-looking guy”

The situation developed…

Usagi: Excuse me, but Haruka's a woman!

Seiya: So, no more sexy guys for you, then? [Hey, where'd this line come from?!]

Seiya: Ah, you're just making excuses.

Usagi: Who is?!

Girl 1: So...he really doesn't know about Haruka?

Girl 2: Do you think they'll follow up on it?

But the episode ended just like that, and until now, they haven't touched upon the matter at all. So, does Seiya still think that Haruka is a man?!

Fighter: Whaaat?! Someone like you is a Sailor Senshi? That's impossible!

SFX: SHOCK

Fighter: After all, you're a man!

Uranus: I thought you were the man.

Fighter: When I transform, I turn back into a woman!

Uranus: I'm originally female.

Fighter: You lie!

Uranus: (Oh, yeah?)

Fighter: Even in a miniskirt, you stand with your legs sprawled apart like the gates of Hell! Before or after you’ve transformed, your ill-mannered attitude and rude speech never changes!

Uranus: I…! [Boku* wa…!]

Fighter: See? If you were a girl, you would say atashi*! The only naturally feminine thing about you is your costume!

*Boku is a masculine form of “I” and atashi is feminine. In the anime, Haruka/Uranus always refers to herself as boku, but Seiya/Fighter switches between masculine and feminine speech: Seiya calls himself ore, (which is even more masculine than Haruka’s boku!) and Fighter uses atashi.

Fighter: Your being a Sailor Senshi must be some kind of mistake...you crossdressing pervert!

Uranus: Well then, a little physical education will make you realize that I'm a true Sailor Senshi! (Woooorld...!)

SFX: GRRRRRRRR

Neptune: Wait a minute. (Hohohohoho...)

Neptune: Seiya-san, you still don't understand Haruka's femininity, do you.

SFX: BOOM [as Haruka's interrupted attack backfires on her]

Uranus: You kinda stopped me at a bad place, Michiru.

Neptune: Oh, I'm sorry.

Uranus: [to herself] Augh! My hair's singed!

Neptune: Seiya, can you detect the fragrance of a rose petal drifting on the ocean waves?

Fighter: ?

Neptune: Can you feel the air rustled by the wing of a tiny bird?

Neptune: Or can you catch a single drop of a maiden's tears before they scatter on the ground?

Neptune: Haruka's femininity originates from just such a higher essence.

Neptune: And only an artist of the highest caliber is capable of sensing such an exquisite aroma.

Neptune: 'Kay?

Uranus: …

Fighter: Please tell me, Princess…is my discipline really so lacking, or…are they just weird?

Uranus: That femininity stuff sounds really severe.

Neptune: Well, you still don't understand it yourself, Haruka…

Music: Loooo loooo loooo loo loooo... [It's their theme from SailormoonS!]