My guess is that most women will prefer vaginal sex. After all, that's the purpose of the vagina, and we have a lot of sexual nerve endings that aren't found anywhere else. Some couples enjoy it, though. If she's up for it you can give it a try. Personally, I've never been interested to try and neither has my husband, so I have no experience.
“This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy.” ― Douglas Adams, The Hitchhiker's Guide to the Galaxy