Those are both great writeups but there was still one point left to be made. :)

To add texture, enhance pleasure, and finally to simulate the penis touching the cervix, let the penis gently slide along the roof of the mouth or hit the top palate in general.

When my girlfriend started this it doubled the pleasure and halved the ... time. :)

Credit for this idea goes to Jane Magazine or some-such publication for women. I don't know which, I'm not the one that read it. ;)

Another Tip that might help some people is the use of crushed or pea-shaped ice. The mouth and penis will usually stabilize temperatures and some sensation may be lost; especially if all of the above tips are not employed. :) A bit of ice will add texture and change the temperature of the mouth. enjoy!