Jumping in here but it is in no way bierasure to see the statue in BS&T as male. If it was just the statue I could see this argument (even if it has "traditionally" male features gender is far more complicated than that). But the video very heavily implies that the Tae and the statue are one and the same.
Tae = Statue
Therefore, Statue = Male.
And one of the members didn't have to stand in. They didn't have to show a member in this scnen or they could have hired another actor/actress. Hell, they could have left it at his JUST kissing the statue. The scene was shot and edited in a way to very explicitly make the connection between the two.
That also in no way invalidates bisexuality to suggest it was a kiss between two men.