Wait where did Andrew Robinson say Garak was asexual? Every interview of his I've ever read he says that he played him as gay or pansexual.
"TZN: I have got another reader question here, that touches a different subject. Did you know that there is speculation about Garak's sexuality?
Robinson: Oh, yeah. I started it."
"I remember when I very first played Garak, I played him gay! I thought this would be great! He sees this young man, this young, very attractive doctor on the station, he is lonely, he is the only Cardassian there, this doctor is curious about him, and if you remember, this was a great moment because Sid totally went with it! When he comes up and he puts his hand on his shoulder, Sid did this great thing, it was this sort of an electrical charge that went through him and so I played him totally gay in that episode."