Slow sex

Make sure your partner is fully  engorged before you enter.  

An engorged vagina is fully of soft, hot, spongy, wet gushy-ness.   

And when she is completely engorged her vaginal will be full, and will  completely surround your penis.

There are something like 8,000 nerve endings in the head of your penis.  Why not try the experiment of moving slowly and feeling every millimeter of your partner?  

There are quite a number of different textures inside of the vaginal canal, and some areas have more nerves and feel more than others. You can even tell them as you go what you are feeling and how good they feel to you!