Totally depends on the people involved.
Also:... No desire to do anything of the sort? o.o
I mean, and I could be wrong here, and don't take this as an insult as it's VERY common, but it sounds like you might be scared.
Sex is like a good massage, it's absurdly pleasurable, and as such easy to recommend to everyone. The only sketchy parts about it come from disease which gets blow way out of proportion and is a non-issue if you're smart about it.
I think, if you really like this woman, you should explain that you are a virgin, and have her ease you into sex. It shouldn't be this tense thing, or something you're feeling stressed about, it's honestly like playing a game of some kind (Find the erogenous zones! How fun!). And really it's probably something you should experience, and as other posters have said physical intimacy is what divides friends from lovers, so it's kind of an oddly important part of relationship (although fuck if the media will admit it).
Really it's nothing to be afraid of as ANYONE can be good at it. No matter your size or whatever it's the art of pleasuring which involves so much more than just the penis.
Oh, and one caveat to all this: If you're under 17, then discard all of what I said. Nothing wrong with having sex at that age (unless you're under 14, in which case, yeah...), but don't feel like you have to rush. But, if you're older than that then I'd say now is the time. Fate has put the ultimatum in front of you and what not.
One way or another, good luck to you sir.