First of all, you sorta left this wide open without much context. Are we dating this person for 6 months? Or married to them for 60 years? I'll assume it's a more long-lasting relationship, because otherwise the obvious answer is touch/sex...otherwise, you can get pretty much the same effect from any number of friends (well maybe not taste) that you would from some 6 month fling or crush.
OK, so assuming really long term...
Taste - no.
Smell - of course not.
Touch - tempting but if you can't see or hear anything this doesn't seem like it would be especially appealing. And even less appealing as time went on.
Hear - that's an interesting one, because the conversation piece like you mentioned is pretty damn important. But even without hearing there are ways to pretty easily communicate with someone if you can...
See - so this would be my answer. The easiest & best way to appreciate stuff around us, whether it's nature or art or people is to be able to *see* it.
Touch, it is one of the most intimate parts of a relationship and one of the best connections for me. Knowing someone is there and being able to feel then is a feeling I can't explain. It'd be torture to see her ad war her and not be able to hold her
Hold her oh so close and whatnot. And I think kiss can count as touching :D never really taste people when I kiss unless I lick them or french kissing or something. If the tongue isn't involved, there won't be taste lol.
I want to be able to know what I am touching. I want to hear his voice...i get the chance to love him for personality...not just feeling him up for sexual enjoyment...but mentally I would be connected to him.
Tasting...seems gross...and Seeing would be good...but not always. And Smelling someone...is really not a nessescity.
I mean think about it...penpals...long distance relationships...crap like that...for hearing...unless the person can't hear.