For your sake, I'd like to be wrong here, but I'm going to guess many experienced guys here will agree with me. Here's how I see it:
First, go for it. Get lots of that freaky sex while its being offered and you both are young. Bang her good. Doggie, 69, lick her azz, anal if she's into it, toys, whatever. See what she's thinking about doing too. Have fun, get wild. It may be a while before you get another shot with a woman who says "let's get freaky" (not that a lot of them are not out there, just that chasing women goes through cycles).
Second, since you took her V-card and are going to be giving her all sorts of good, crazy sex, her brain is inevitably going to think this: "Wow, this is great. Sooo much fun!! But, I've only been with this one guy. I wonder what sex is like with other guys. I mean, just mathematically speaking, some guys are going to be worse than others and some guys are going to be much, much better than others. Since I've only been laid by one guy, I have no idea if I'm getting the good stuff now or if this is just tame compared to the skill of other men?" Trust me, this will go through her brain. In this day and age, women have so many men hitting on them and with the "hook-up culture" mentality we are going through, it's only a matter of time until your girl decides to sample the offerings out there.
Statistically, this is the probable scenario. It's not 100% guaranteed to happen, but it is much more likely than not.
A buddy several years ago in a relationship with a great woman, incredibly compatible with him, nice, fun to hang out with and all that, did exactly this to him. He felt ripped off, jilted, unjustifiably screwed over. Couldn't blame him. I'm sure many guys on this board have similar stories of either themselves or someone they know.
So, have as much fun now as you can. It'll end not too far down the road.
The upside is that YOU will also get some new experiences to take to the next woman that ends up in your bed. Plus, you'll get some additional jerk material for your imagination.
That's my two cents. Interested to see what other guys here have to tell you. Good luck!