In reply to balmybaldwin:
I have just got my slightly nervous bf into climbing. Agree with everything balmybladwin said, especially the bits about explaining everything and making sure she is happy belaying, and that you are happy with her belaying.
I found that weekend trips away to places where there are plenty of other things to do are good, that way you don't have to climb all the time, and it won't feel like a waste if she doesn't enjoy it. N Wales, the Gower and Cornwall have been good so far, lots of walking/surfing/beaches etc. Do one day climbing, and one day doing something else.
Other tips:
Avoid venues you have to ab in to.
Slabby stuff is good, it doesn't feel so exposed. Ditto routes up corners.
Try and climb straight-up routes with good abseil anchors at the top so you can retrieve gear if she wants to back off, there is less pressure on her then.
Don't make her do anything she doesn't want to. Don't take the piss if she backs off things or gets scared. Take it easy. Never say "one more route" when she has had enough.
Don't stop climbing with your other mates...you will get frustrated if you only climb with her and it'll all go pear shaped.
I haven't done any toproping with the BF, he's just seconded me up things, but it seems to work...I got him to belay me on lead lots indoors before we went out though. On the first couple of routes, where there weren't many people and there was a walk up, I took him to the top to show him the stance first so he could see it was safe. I also found it useful to let him place bits of my rack round the bottom of the crag so he knew how things worked.
Good luck!
M