Arturo: Hi there Aly.
I'm a new member and I seize this opportunity to join the chit-chat.
To answer your question, I wouldn't like the idea much. As it happens, I'm sometimes shy about the endowment question as it is. Let's say that it can be a bit embarassing for an intimate part of you to become the centre of interest(be it for a few minutes...) When I was 18 and quite unexperienced, I used to baulk at the idea of disclosing my penis too openly the first times, wondered if it would pass the test as it were. Now at 32, I'm not that concerned anymore mainly because my girlfriends have never really showed much more than a passing interest. But also because I agree that in long term relationships, trust and understanding(and sometimes patience:)!) weigh so much more in the balance.
As for being primarily attracted to someone on the basis of a physical attribute, I really don't see that it would make you shallow or unsensitive. It certainly does not mean that you're not capable of love and warmth. We may talk at lengths about penis and bra size, but we all know that those subjects have little or nothing to do with our deeper human needs.
Sorry if I was a little long-winded about this, first-post-syndrome I suppose:)!
Take care