Yes, I temp vaginally.
If you click on my charting blinkie you can see my recent cycles ... and then the CYCLES FROM HECK before them. Horrible rocky temps is all I ended up with temping orally! Vaginal temping makes all the difference for me. I can actually see what's going on.
And yes, it's faster too!
ETA: If someone marks "other", I'd like them to explain too! Thanks for putting "please explain".