posted January 18, 2013 04:35 PM
My ex (who I lived with for three years) is an Aries/Virgo. I'm a Cancer, and I got along better with his Moon than I did his Sun, so take that in to consideration 
If the person you are wondering about has their Sun quincunx their Moon then what I have to say will probably be more likely to apply. I find with quincunxes, especially with Sun/Moon, you have someone who has a difficult time knowing what's up with both Sun and Moon energies at the same time. If they are accessing their Sun energy, then it's as if they temporarily forget all about their Moon energy and vice versa.
An example of what I mean: we often had a similar argument over the years. If I wanted to talk about what was troubling him, then his Virgo Moon would resist any probing and/or make attempts to intellectualize what he was feeling. He would shut down, get very cold and disconnect. If I wanted to talk about what was troubling me, then his Aries Sun would jump in and demand to know why we were always focused on my issues. It was a no-win situation for me. I'm not saying that this happened every time we talked, but it was a pattern and illustrates my point that a quincunx is a disconnect between the energies of the two planets.
Basically, it's like his Sun and Moon rarely sat down for a cup of tea, to see if they were on the same page.
As for laid back, my ex has a Sag Ascendant so he definitely gave the impression of being laid back. I knew him really well though and I wouldn't call him that. He was reserved though but I find that's a Virgo Moon thing in general.
When he really opened up emotionally, he would be incredibly delicate and almost fragile (in a childlike way) which I find is true for all the Virgo Moons I have known. I think that they hide so much sensitivity under all the practical logic and compartmentalization so it has always seemed to me that because they don't get as much practice opening up, when they do it has a purity to it. (And I always feel like it's such an honour when a Virgo Moon cries in front of me, even if they have to start immediately organizing something as soon as they're done. LOL)
Socially, I found that Aries Sun wants to have an entourage of friends and then Virgo Moon will suddenly decide that it's time to be alone to re-compartmentalize and then that night it's all about cleaning the house (which is like a reset button for Virgo Moons, on an emotional level).
I think that my ex identified more so with his Moon, often to the detriment of his Sun which would come through in more passive aggressive ways because that energy was being ignored.
Anyhow, that's my experience in a nutshell.
ETA: I think whether a person relates more to the Sun or Moon depends partly on the chart and partly on how he/she is raised. ie - My ex has Chiron conjunct his Sun so there is a woundedness and pain associated with expressing his Sun energy and also his mother is a Virgo so his Virgo energy was (imo) more acceptable and encouraged when he was growing up.